Commit | Line | Data |
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29fa45f4 | 1 | ;;; GNU Guix --- Functional package management for GNU |
b782688d | 2 | ;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org> |
577c02eb | 3 | ;;; Copyright © 2015 David Thompson <davet@gnu.org> |
4f8cede0 | 4 | ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org> |
8336df06 | 5 | ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> |
0dc5c856 | 6 | ;;; Copyright © 2019 Guillaume Le Vaillant <glv@posteo.net> |
fd546bbb | 7 | ;;; Copyright © 2020 Julien Lepiller <julien@lepiller.eu> |
598be42d | 8 | ;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org> |
29fa45f4 LC |
9 | ;;; |
10 | ;;; This file is part of GNU Guix. | |
11 | ;;; | |
12 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
13 | ;;; under the terms of the GNU General Public License as published by | |
14 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
15 | ;;; your option) any later version. | |
16 | ;;; | |
17 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
18 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;;; GNU General Public License for more details. | |
21 | ;;; | |
22 | ;;; You should have received a copy of the GNU General Public License | |
23 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
24 | ||
25 | (define-module (guix build syscalls) | |
26 | #:use-module (system foreign) | |
86f5decd | 27 | #:use-module (system base target) |
29fa45f4 | 28 | #:use-module (rnrs bytevectors) |
3483f004 | 29 | #:autoload (ice-9 binary-ports) (get-bytevector-n) |
29fa45f4 | 30 | #:use-module (srfi srfi-1) |
e7f5691d LC |
31 | #:use-module (srfi srfi-9) |
32 | #:use-module (srfi srfi-9 gnu) | |
26ffb693 | 33 | #:use-module (srfi srfi-11) |
15030972 | 34 | #:use-module (srfi srfi-19) |
fa73c193 | 35 | #:use-module (srfi srfi-26) |
29fa45f4 | 36 | #:use-module (ice-9 rdelim) |
4d54785c | 37 | #:use-module (ice-9 regex) |
29fa45f4 | 38 | #:use-module (ice-9 match) |
17a4d344 | 39 | #:use-module (ice-9 ftw) |
26ffb693 | 40 | #:export (MS_RDONLY |
577c02eb DT |
41 | MS_NOSUID |
42 | MS_NODEV | |
43 | MS_NOEXEC | |
29fa45f4 | 44 | MS_REMOUNT |
9d305381 | 45 | MS_NOATIME |
29fa45f4 LC |
46 | MS_BIND |
47 | MS_MOVE | |
577c02eb | 48 | MS_STRICTATIME |
0dc5c856 | 49 | MS_LAZYTIME |
b16d138a DT |
50 | MNT_FORCE |
51 | MNT_DETACH | |
52 | MNT_EXPIRE | |
53 | UMOUNT_NOFOLLOW | |
25c7ff6a | 54 | |
ea982704 | 55 | restart-on-EINTR |
ccea821b | 56 | mount-points |
715fc9d4 LC |
57 | swapon |
58 | swapoff | |
a1f70878 LC |
59 | |
60 | file-system? | |
61 | file-system-type | |
62 | file-system-block-size | |
63 | file-system-block-count | |
64 | file-system-blocks-free | |
65 | file-system-blocks-available | |
66 | file-system-file-count | |
67 | file-system-free-file-nodes | |
68 | file-system-identifier | |
69 | file-system-maximum-name-length | |
70 | file-system-fragment-size | |
200dac06 | 71 | file-system-mount-flags |
a1f70878 | 72 | statfs |
65f224dc | 73 | free-disk-space |
b08bea04 | 74 | device-in-use? |
5e5f7167 | 75 | add-to-entropy-count |
a1f70878 | 76 | |
7585016f | 77 | processes |
b4abdeb6 | 78 | mkdtemp! |
1752a17a | 79 | fdatasync |
df3ce5c1 | 80 | pivot-root |
fa73c193 | 81 | scandir* |
b7178c22 | 82 | |
4e0ea3eb | 83 | fcntl-flock |
b7178c22 LC |
84 | lock-file |
85 | unlock-file | |
86 | with-file-lock | |
f49e9131 | 87 | with-file-lock/no-wait |
973eea34 | 88 | |
aa401f9b LC |
89 | set-thread-name |
90 | thread-name | |
91 | ||
ee78d024 DT |
92 | CLONE_CHILD_CLEARTID |
93 | CLONE_CHILD_SETTID | |
8950ed11 DT |
94 | CLONE_NEWNS |
95 | CLONE_NEWUTS | |
96 | CLONE_NEWIPC | |
97 | CLONE_NEWUSER | |
98 | CLONE_NEWPID | |
99 | CLONE_NEWNET | |
100 | clone | |
43ace6ea | 101 | setns |
8950ed11 | 102 | |
3ca33769 LC |
103 | PF_PACKET |
104 | AF_PACKET | |
b89e7405 LC |
105 | all-network-interface-names |
106 | network-interface-names | |
67e5f3b7 | 107 | network-interface-netmask |
0bc6fe32 | 108 | network-interface-running? |
c9bf64d6 | 109 | loopback-network-interface? |
5f5499d6 | 110 | arp-network-interface? |
c9bf64d6 | 111 | network-interface-address |
67e5f3b7 | 112 | set-network-interface-netmask |
6944fdbd | 113 | set-network-interface-up |
e7f5691d | 114 | configure-network-interface |
9e38e3cf LC |
115 | add-network-route/gateway |
116 | delete-network-route | |
e7f5691d LC |
117 | |
118 | interface? | |
119 | interface-name | |
120 | interface-flags | |
121 | interface-address | |
122 | interface-netmask | |
123 | interface-broadcast-address | |
29ff6d9f LC |
124 | network-interfaces |
125 | ||
ae4ff9f3 LC |
126 | termios? |
127 | termios-input-flags | |
128 | termios-output-flags | |
129 | termios-control-flags | |
130 | termios-local-flags | |
131 | termios-line-discipline | |
132 | termios-control-chars | |
133 | termios-input-speed | |
134 | termios-output-speed | |
135 | local-flags | |
45c32bd7 | 136 | input-flags |
a8f3424b | 137 | tcsetattr-action |
ae4ff9f3 LC |
138 | tcgetattr |
139 | tcsetattr | |
140 | ||
29ff6d9f LC |
141 | window-size? |
142 | window-size-rows | |
143 | window-size-columns | |
144 | window-size-x-pixels | |
145 | window-size-y-pixels | |
146 | terminal-window-size | |
15030972 | 147 | terminal-columns |
4593f5a6 | 148 | terminal-rows |
15030972 LC |
149 | |
150 | utmpx? | |
151 | utmpx-login-type | |
152 | utmpx-pid | |
153 | utmpx-line | |
154 | utmpx-id | |
155 | utmpx-user | |
156 | utmpx-host | |
157 | utmpx-termination-status | |
158 | utmpx-exit-status | |
159 | utmpx-session-id | |
160 | utmpx-time | |
161 | utmpx-address | |
162 | login-type | |
3483f004 LC |
163 | utmpx-entries |
164 | (read-utmpx-from-port . read-utmpx))) | |
29fa45f4 LC |
165 | |
166 | ;;; Commentary: | |
167 | ;;; | |
168 | ;;; This module provides bindings to libc's syscall wrappers. It uses the | |
8336df06 MO |
169 | ;;; FFI, and thus requires a dynamically-linked Guile. |
170 | ;;; | |
171 | ;;; Some syscalls are already defined in statically-linked Guile by applying | |
172 | ;;; 'guile-linux-syscalls.patch'. | |
173 | ;;; | |
174 | ;;; Visibility of syscall's symbols shared between this module and static Guile | |
175 | ;;; is a bit delicate. It is handled by 'define-as-needed' macro. | |
176 | ;;; | |
177 | ;;; This macro is used to export symbols in dynamic Guile context, and to | |
178 | ;;; re-export them in static Guile context. | |
179 | ;;; | |
180 | ;;; This way, even if they don't appear in #:export list, it is safe to use | |
181 | ;;; syscalls from this module in static or dynamic Guile context. | |
29fa45f4 LC |
182 | ;;; |
183 | ;;; Code: | |
184 | ||
73f38d5f LC |
185 | \f |
186 | ;;; | |
187 | ;;; Packed structures. | |
188 | ;;; | |
189 | ||
190 | (define-syntax sizeof* | |
191 | ;; XXX: This duplicates 'compile-time-value'. | |
00cd4197 | 192 | (syntax-rules (int128 array) |
73f38d5f LC |
193 | ((_ int128) |
194 | 16) | |
00cd4197 LC |
195 | ((_ (array type n)) |
196 | (* (sizeof* type) n)) | |
73f38d5f LC |
197 | ((_ type) |
198 | (let-syntax ((v (lambda (s) | |
86f5decd LC |
199 | ;; When compiling natively, call 'sizeof' at expansion |
200 | ;; time; otherwise, emit code to call it at run time. | |
201 | (syntax-case s () | |
202 | (_ | |
203 | (if (= (target-word-size) | |
204 | (with-target %host-type target-word-size)) | |
205 | (sizeof type) | |
206 | #'(sizeof type))))))) | |
73f38d5f LC |
207 | v)))) |
208 | ||
209 | (define-syntax alignof* | |
210 | ;; XXX: This duplicates 'compile-time-value'. | |
00cd4197 | 211 | (syntax-rules (int128 array) |
73f38d5f LC |
212 | ((_ int128) |
213 | 16) | |
00cd4197 LC |
214 | ((_ (array type n)) |
215 | (alignof* type)) | |
73f38d5f LC |
216 | ((_ type) |
217 | (let-syntax ((v (lambda (s) | |
86f5decd LC |
218 | ;; When compiling natively, call 'sizeof' at expansion |
219 | ;; time; otherwise, emit code to call it at run time. | |
220 | (syntax-case s () | |
221 | (_ | |
222 | (if (= (target-word-size) | |
223 | (with-target %host-type target-word-size)) | |
224 | (alignof type) | |
225 | #'(alignof type))))))) | |
73f38d5f LC |
226 | v)))) |
227 | ||
228 | (define-syntax align ;as found in (system foreign) | |
229 | (syntax-rules (~) | |
230 | "Add to OFFSET whatever it takes to get proper alignment for TYPE." | |
231 | ((_ offset (type ~ endianness)) | |
232 | (align offset type)) | |
233 | ((_ offset type) | |
234 | (1+ (logior (1- offset) (1- (alignof* type))))))) | |
235 | ||
236 | (define-syntax type-size | |
237 | (syntax-rules (~) | |
238 | ((_ (type ~ order)) | |
239 | (sizeof* type)) | |
240 | ((_ type) | |
241 | (sizeof* type)))) | |
242 | ||
785cfa87 LC |
243 | (define-syntax struct-alignment |
244 | (syntax-rules () | |
245 | "Compute the alignment for the aggregate made of TYPES at OFFSET. The | |
246 | result is the alignment of the \"most strictly aligned component\"." | |
247 | ((_ offset types ...) | |
248 | (max (align offset types) ...)))) | |
249 | ||
250 | (define-syntax struct-size | |
251 | (syntax-rules () | |
252 | "Return the size in bytes of the structure made of TYPES." | |
253 | ((_ offset (types-processed ...)) | |
254 | ;; The SysV ABI P.S. says: "Aggregates (structures and arrays) and unions | |
255 | ;; assume the alignment of their most strictly aligned component." As an | |
256 | ;; example, a struct such as "int32, int16" has size 8, not 6. | |
257 | (1+ (logior (1- offset) | |
258 | (1- (struct-alignment offset types-processed ...))))) | |
259 | ((_ offset (types-processed ...) type0 types ...) | |
260 | (struct-size (+ (type-size type0) (align offset type0)) | |
261 | (type0 types-processed ...) | |
262 | types ...)))) | |
263 | ||
73f38d5f | 264 | (define-syntax write-type |
f43714e6 | 265 | (syntax-rules (~ array *) |
73f38d5f LC |
266 | ((_ bv offset (type ~ order) value) |
267 | (bytevector-uint-set! bv offset value | |
268 | (endianness order) (sizeof* type))) | |
00cd4197 LC |
269 | ((_ bv offset (array type n) value) |
270 | (let loop ((i 0) | |
271 | (value value) | |
272 | (o offset)) | |
273 | (unless (= i n) | |
274 | (match value | |
275 | ((head . tail) | |
276 | (write-type bv o type head) | |
277 | (loop (+ 1 i) tail (+ o (sizeof* type)))))))) | |
f43714e6 LC |
278 | ((_ bv offset '* value) |
279 | (bytevector-uint-set! bv offset (pointer-address value) | |
280 | (native-endianness) (sizeof* '*))) | |
73f38d5f LC |
281 | ((_ bv offset type value) |
282 | (bytevector-uint-set! bv offset value | |
283 | (native-endianness) (sizeof* type))))) | |
284 | ||
285 | (define-syntax write-types | |
286 | (syntax-rules () | |
287 | ((_ bv offset () ()) | |
288 | #t) | |
289 | ((_ bv offset (type0 types ...) (field0 fields ...)) | |
290 | (begin | |
291 | (write-type bv (align offset type0) type0 field0) | |
292 | (write-types bv | |
293 | (+ (align offset type0) (type-size type0)) | |
294 | (types ...) (fields ...)))))) | |
295 | ||
296 | (define-syntax read-type | |
00cd4197 | 297 | (syntax-rules (~ array quote *) |
73f38d5f LC |
298 | ((_ bv offset '*) |
299 | (make-pointer (bytevector-uint-ref bv offset | |
300 | (native-endianness) | |
301 | (sizeof* '*)))) | |
302 | ((_ bv offset (type ~ order)) | |
303 | (bytevector-uint-ref bv offset | |
304 | (endianness order) (sizeof* type))) | |
00cd4197 LC |
305 | ((_ bv offset (array type n)) |
306 | (unfold (lambda (i) (= i n)) | |
307 | (lambda (i) | |
308 | (read-type bv (+ offset (* i (sizeof* type))) type)) | |
309 | 1+ | |
310 | 0)) | |
73f38d5f LC |
311 | ((_ bv offset type) |
312 | (bytevector-uint-ref bv offset | |
313 | (native-endianness) (sizeof* type))))) | |
314 | ||
315 | (define-syntax read-types | |
316 | (syntax-rules () | |
317 | ((_ return bv offset () (values ...)) | |
318 | (return values ...)) | |
319 | ((_ return bv offset (type0 types ...) (values ...)) | |
320 | (read-types return | |
321 | bv | |
322 | (+ (align offset type0) (type-size type0)) | |
323 | (types ...) | |
324 | (values ... (read-type bv | |
325 | (align offset type0) | |
326 | type0)))))) | |
327 | ||
8eb790f3 LC |
328 | (define-syntax define-c-struct-macro |
329 | (syntax-rules () | |
330 | "Define NAME as a macro that can be queried to get information about the C | |
331 | struct it represents. In particular: | |
332 | ||
333 | (NAME field-offset FIELD) | |
334 | ||
335 | returns the offset in bytes of FIELD within the C struct represented by NAME." | |
336 | ((_ name ((fields types) ...)) | |
337 | (define-c-struct-macro name | |
338 | (fields ...) 0 () | |
339 | ((fields types) ...))) | |
340 | ((_ name (fields ...) offset (clauses ...) ((field type) rest ...)) | |
341 | (define-c-struct-macro name | |
342 | (fields ...) | |
343 | (+ (align offset type) (type-size type)) | |
344 | (clauses ... ((_ field-offset field) (align offset type))) | |
345 | (rest ...))) | |
346 | ((_ name (fields ...) offset (clauses ...) ()) | |
347 | (define-syntax name | |
348 | (syntax-rules (field-offset fields ...) | |
349 | clauses ...))))) | |
350 | ||
73f38d5f LC |
351 | (define-syntax define-c-struct |
352 | (syntax-rules () | |
785cfa87 LC |
353 | "Define SIZE as the size in bytes of the C structure made of FIELDS. READ |
354 | as a deserializer and WRITE! as a serializer for the C structure with the | |
355 | given TYPES. READ uses WRAP-FIELDS to return its value." | |
356 | ((_ name size wrap-fields read write! (fields types) ...) | |
73f38d5f | 357 | (begin |
8eb790f3 LC |
358 | (define-c-struct-macro name |
359 | ((fields types) ...)) | |
785cfa87 LC |
360 | (define size |
361 | (struct-size 0 () types ...)) | |
73f38d5f LC |
362 | (define (write! bv offset fields ...) |
363 | (write-types bv offset (types ...) (fields ...))) | |
f77863a0 | 364 | (define* (read bv #:optional (offset 0)) |
73f38d5f LC |
365 | (read-types wrap-fields bv offset (types ...) ())))))) |
366 | ||
8eb790f3 LC |
367 | (define-syntax-rule (c-struct-field-offset type field) |
368 | "Return the offset in BYTES of FIELD within TYPE, where TYPE is a C struct | |
369 | defined with 'define-c-struct' and FIELD is a field identifier. An | |
370 | expansion-time error is raised if FIELD does not exist in TYPE." | |
371 | (type field-offset field)) | |
372 | ||
73f38d5f LC |
373 | \f |
374 | ;;; | |
375 | ;;; FFI. | |
376 | ;;; | |
377 | ||
ea982704 LC |
378 | (define (call-with-restart-on-EINTR thunk) |
379 | (let loop () | |
380 | (catch 'system-error | |
381 | thunk | |
382 | (lambda args | |
383 | (if (= (system-error-errno args) EINTR) | |
384 | (loop) | |
385 | (apply throw args)))))) | |
386 | ||
387 | (define-syntax-rule (restart-on-EINTR expr) | |
388 | "Evaluate EXPR and restart upon EINTR. Return the value of EXPR." | |
389 | (call-with-restart-on-EINTR (lambda () expr))) | |
390 | ||
4f8cede0 | 391 | (define (syscall->procedure return-type name argument-types) |
26ffb693 LC |
392 | "Return a procedure that wraps the C function NAME using the dynamic FFI, |
393 | and that returns two values: NAME's return value, and errno. | |
394 | ||
4f8cede0 MW |
395 | If an error occurs while creating the binding, defer the error report until |
396 | the returned procedure is called." | |
397 | (catch #t | |
398 | (lambda () | |
399 | (let ((ptr (dynamic-func name (dynamic-link)))) | |
26ffb693 | 400 | ;; The #:return-errno? facility was introduced in Guile 2.0.12. |
1d84d7bf LC |
401 | (pointer->procedure return-type ptr argument-types |
402 | #:return-errno? #t))) | |
4f8cede0 MW |
403 | (lambda args |
404 | (lambda _ | |
f8121329 LC |
405 | (throw 'system-error name "~A" (list (strerror ENOSYS)) |
406 | (list ENOSYS)))))) | |
4f8cede0 | 407 | |
8336df06 MO |
408 | (define-syntax define-as-needed |
409 | (syntax-rules () | |
410 | "Define VARIABLE. If VARIABLE already exists in (guile) then re-export it, | |
411 | otherwise export the newly-defined VARIABLE." | |
412 | ((_ (proc args ...) body ...) | |
413 | (define-as-needed proc (lambda* (args ...) body ...))) | |
414 | ((_ variable value) | |
96783ed6 LC |
415 | (if (module-defined? the-scm-module 'variable) |
416 | (module-re-export! (current-module) '(variable)) | |
417 | (begin | |
418 | (module-define! (current-module) 'variable value) | |
419 | (module-export! (current-module) '(variable))))))) | |
8336df06 | 420 | |
73f38d5f LC |
421 | \f |
422 | ;;; | |
423 | ;;; File systems. | |
424 | ;;; | |
425 | ||
29fa45f4 LC |
426 | (define (augment-mtab source target type options) |
427 | "Augment /etc/mtab with information about the given mount point." | |
428 | (let ((port (open-file "/etc/mtab" "a"))) | |
429 | (format port "~a ~a ~a ~a 0 0~%" | |
430 | source target type (or options "rw")) | |
431 | (close-port port))) | |
432 | ||
433 | (define (read-mtab port) | |
434 | "Read an mtab-formatted file from PORT, returning a list of tuples." | |
435 | (let loop ((result '())) | |
436 | (let ((line (read-line port))) | |
437 | (if (eof-object? line) | |
438 | (reverse result) | |
439 | (loop (cons (string-tokenize line) result)))))) | |
440 | ||
441 | (define (remove-from-mtab target) | |
442 | "Remove mount point TARGET from /etc/mtab." | |
443 | (define entries | |
444 | (remove (match-lambda | |
445 | ((device mount-point type options freq passno) | |
446 | (string=? target mount-point)) | |
447 | (_ #f)) | |
cd4a3cb3 | 448 | (call-with-input-file "/etc/mtab" read-mtab))) |
29fa45f4 | 449 | |
cd4a3cb3 | 450 | (call-with-output-file "/etc/mtab" |
29fa45f4 LC |
451 | (lambda (port) |
452 | (for-each (match-lambda | |
453 | ((device mount-point type options freq passno) | |
454 | (format port "~a ~a ~a ~a ~a ~a~%" | |
455 | device mount-point type options freq passno))) | |
456 | entries)))) | |
457 | ||
458 | ;; Linux mount flags, from libc's <sys/mount.h>. | |
577c02eb DT |
459 | (define MS_RDONLY 1) |
460 | (define MS_NOSUID 2) | |
461 | (define MS_NODEV 4) | |
462 | (define MS_NOEXEC 8) | |
463 | (define MS_REMOUNT 32) | |
9d305381 | 464 | (define MS_NOATIME 1024) |
577c02eb DT |
465 | (define MS_BIND 4096) |
466 | (define MS_MOVE 8192) | |
467 | (define MS_STRICTATIME 16777216) | |
0dc5c856 | 468 | (define MS_LAZYTIME 33554432) |
29fa45f4 | 469 | |
b16d138a DT |
470 | (define MNT_FORCE 1) |
471 | (define MNT_DETACH 2) | |
472 | (define MNT_EXPIRE 4) | |
473 | (define UMOUNT_NOFOLLOW 8) | |
474 | ||
7df4d346 MO |
475 | (define-as-needed (mount source target type |
476 | #:optional (flags 0) options | |
f91fcd9c | 477 | #:key (update-mtab? #f)) |
7df4d346 | 478 | "Mount device SOURCE on TARGET as a file system TYPE. |
f91fcd9c MO |
479 | Optionally, FLAGS may be a bitwise-or of the MS_* <sys/mount.h> |
480 | constants, and OPTIONS may be a string. When FLAGS contains | |
481 | MS_REMOUNT, SOURCE and TYPE are ignored. When UPDATE-MTAB? is true, | |
482 | update /etc/mtab. Raise a 'system-error' exception on error." | |
7df4d346 MO |
483 | ;; XXX: '#:update-mtab?' is not implemented by core 'mount'. |
484 | (let ((proc (syscall->procedure int "mount" `(* * * ,unsigned-long *)))) | |
485 | (let-values (((ret err) | |
486 | (proc (if source | |
487 | (string->pointer source) | |
488 | %null-pointer) | |
489 | (string->pointer target) | |
490 | (if type | |
491 | (string->pointer type) | |
492 | %null-pointer) | |
493 | flags | |
494 | (if options | |
495 | (string->pointer options) | |
496 | %null-pointer)))) | |
497 | (unless (zero? ret) | |
498 | (throw 'system-error "mount" "mount ~S on ~S: ~A" | |
499 | (list source target (strerror err)) | |
500 | (list err))) | |
501 | (when update-mtab? | |
502 | (augment-mtab source target type options))))) | |
503 | ||
504 | (define-as-needed (umount target | |
505 | #:optional (flags 0) | |
506 | #:key (update-mtab? #f)) | |
507 | "Unmount TARGET. Optionally FLAGS may be one of the MNT_* or UMOUNT_* | |
29fa45f4 | 508 | constants from <sys/mount.h>." |
7df4d346 MO |
509 | ;; XXX: '#:update-mtab?' is not implemented by core 'umount'. |
510 | (let ((proc (syscall->procedure int "umount2" `(* ,int)))) | |
511 | (let-values (((ret err) | |
512 | (proc (string->pointer target) flags))) | |
513 | (unless (zero? ret) | |
514 | (throw 'system-error "umount" "~S: ~A" | |
515 | (list target (strerror err)) | |
516 | (list err))) | |
517 | (when update-mtab? | |
518 | (remove-from-mtab target))))) | |
29fa45f4 | 519 | |
ccea821b LC |
520 | (define (mount-points) |
521 | "Return the mounts points for currently mounted file systems." | |
522 | (call-with-input-file "/proc/mounts" | |
523 | (lambda (port) | |
524 | (let loop ((result '())) | |
525 | (let ((line (read-line port))) | |
526 | (if (eof-object? line) | |
527 | (reverse result) | |
528 | (match (string-tokenize line) | |
529 | ((source mount-point _ ...) | |
530 | (loop (cons mount-point result)))))))))) | |
531 | ||
715fc9d4 | 532 | (define swapon |
4f8cede0 | 533 | (let ((proc (syscall->procedure int "swapon" (list '* int)))) |
715fc9d4 LC |
534 | (lambda* (device #:optional (flags 0)) |
535 | "Use the block special device at DEVICE for swapping." | |
26ffb693 LC |
536 | (let-values (((ret err) |
537 | (proc (string->pointer device) flags))) | |
715fc9d4 LC |
538 | (unless (zero? ret) |
539 | (throw 'system-error "swapon" "~S: ~A" | |
540 | (list device (strerror err)) | |
541 | (list err))))))) | |
542 | ||
543 | (define swapoff | |
4f8cede0 | 544 | (let ((proc (syscall->procedure int "swapoff" '(*)))) |
715fc9d4 LC |
545 | (lambda (device) |
546 | "Stop using block special device DEVICE for swapping." | |
26ffb693 | 547 | (let-values (((ret err) (proc (string->pointer device)))) |
715fc9d4 | 548 | (unless (zero? ret) |
60a56db0 | 549 | (throw 'system-error "swapoff" "~S: ~A" |
715fc9d4 LC |
550 | (list device (strerror err)) |
551 | (list err))))))) | |
552 | ||
8336df06 MO |
553 | (define-as-needed RB_AUTOBOOT #x01234567) |
554 | (define-as-needed RB_HALT_SYSTEM #xcdef0123) | |
555 | (define-as-needed RB_ENABLED_CAD #x89abcdef) | |
556 | (define-as-needed RB_DISABLE_CAD 0) | |
557 | (define-as-needed RB_POWER_OFF #x4321fedc) | |
558 | (define-as-needed RB_SW_SUSPEND #xd000fce2) | |
559 | (define-as-needed RB_KEXEC #x45584543) | |
560 | ||
561 | (define-as-needed (reboot #:optional (cmd RB_AUTOBOOT)) | |
562 | (let ((proc (syscall->procedure int "reboot" (list int)))) | |
563 | (let-values (((ret err) (proc cmd))) | |
564 | (unless (zero? ret) | |
565 | (throw 'system-error "reboot" "~S: ~A" | |
566 | (list cmd (strerror err)) | |
567 | (list err)))))) | |
568 | ||
23e525e1 MO |
569 | (define-as-needed (load-linux-module data #:optional (options "")) |
570 | (let ((proc (syscall->procedure int "init_module" | |
571 | (list '* unsigned-long '*)))) | |
572 | (let-values (((ret err) | |
573 | (proc (bytevector->pointer data) | |
574 | (bytevector-length data) | |
575 | (string->pointer options)))) | |
576 | (unless (zero? ret) | |
577 | (throw 'system-error "load-linux-module" "~A" | |
578 | (list (strerror err)) | |
579 | (list err)))))) | |
580 | ||
17a4d344 LC |
581 | (define (kernel? pid) |
582 | "Return #t if PID designates a \"kernel thread\" rather than a normal | |
583 | user-land process." | |
584 | (let ((stat (call-with-input-file (format #f "/proc/~a/stat" pid) | |
585 | (compose string-tokenize read-string)))) | |
586 | ;; See proc.txt in Linux's documentation for the list of fields. | |
587 | (match stat | |
588 | ((pid tcomm state ppid pgrp sid tty_nr tty_pgrp flags min_flt | |
589 | cmin_flt maj_flt cmaj_flt utime stime cutime cstime | |
590 | priority nice num_thread it_real_value start_time | |
591 | vsize rss rsslim | |
592 | (= string->number start_code) (= string->number end_code) _ ...) | |
593 | ;; Got this obscure trick from sysvinit's 'killall5' program. | |
594 | (and (zero? start_code) (zero? end_code)))))) | |
595 | ||
596 | (define (processes) | |
597 | "Return the list of live processes." | |
598 | (sort (filter-map (lambda (file) | |
599 | (let ((pid (string->number file))) | |
600 | (and pid | |
601 | (not (kernel? pid)) | |
602 | pid))) | |
603 | (scandir "/proc")) | |
604 | <)) | |
605 | ||
b4abdeb6 | 606 | (define mkdtemp! |
d1f33ba4 | 607 | (let ((proc (syscall->procedure '* "mkdtemp" '(*)))) |
b4abdeb6 DT |
608 | (lambda (tmpl) |
609 | "Create a new unique directory in the file system using the template | |
610 | string TMPL and return its file name. TMPL must end with 'XXXXXX'." | |
26ffb693 | 611 | (let-values (((result err) (proc (string->pointer tmpl)))) |
b4abdeb6 DT |
612 | (when (null-pointer? result) |
613 | (throw 'system-error "mkdtemp!" "~S: ~A" | |
614 | (list tmpl (strerror err)) | |
615 | (list err))) | |
616 | (pointer->string result))))) | |
617 | ||
1752a17a LC |
618 | (define fdatasync |
619 | (let ((proc (syscall->procedure int "fdatasync" (list int)))) | |
620 | (lambda (port) | |
621 | "Flush buffered output of PORT, an output file port, and then call | |
622 | fdatasync(2) on the underlying file descriptor." | |
623 | (force-output port) | |
26ffb693 LC |
624 | (let*-values (((fd) (fileno port)) |
625 | ((ret err) (proc fd))) | |
1752a17a LC |
626 | (unless (zero? ret) |
627 | (throw 'system-error "fdatasync" "~S: ~A" | |
628 | (list fd (strerror err)) | |
629 | (list err))))))) | |
630 | ||
a1f70878 LC |
631 | |
632 | (define-record-type <file-system> | |
633 | (file-system type block-size blocks blocks-free | |
634 | blocks-available files free-files identifier | |
00cd4197 | 635 | name-length fragment-size mount-flags spare) |
a1f70878 LC |
636 | file-system? |
637 | (type file-system-type) | |
638 | (block-size file-system-block-size) | |
639 | (blocks file-system-block-count) | |
640 | (blocks-free file-system-blocks-free) | |
641 | (blocks-available file-system-blocks-available) | |
642 | (files file-system-file-count) | |
643 | (free-files file-system-free-file-nodes) | |
644 | (identifier file-system-identifier) | |
645 | (name-length file-system-maximum-name-length) | |
646 | (fragment-size file-system-fragment-size) | |
200dac06 | 647 | (mount-flags file-system-mount-flags) |
00cd4197 | 648 | (spare file-system--spare)) |
a1f70878 LC |
649 | |
650 | (define-syntax fsword ;fsword_t | |
651 | (identifier-syntax long)) | |
652 | ||
200dac06 | 653 | (define-c-struct %statfs ;<bits/statfs.h> |
a1f70878 LC |
654 | sizeof-statfs ;slightly overestimated |
655 | file-system | |
656 | read-statfs | |
657 | write-statfs! | |
658 | (type fsword) | |
659 | (block-size fsword) | |
660 | (blocks uint64) | |
661 | (blocks-free uint64) | |
662 | (blocks-available uint64) | |
663 | (files uint64) | |
664 | (free-files uint64) | |
00cd4197 | 665 | (identifier (array int 2)) |
a1f70878 LC |
666 | (name-length fsword) |
667 | (fragment-size fsword) | |
200dac06 | 668 | (mount-flags fsword) |
00cd4197 | 669 | (spare (array fsword 4))) |
a1f70878 LC |
670 | |
671 | (define statfs | |
96f2a432 | 672 | (let ((proc (syscall->procedure int "statfs64" '(* *)))) |
a1f70878 LC |
673 | (lambda (file) |
674 | "Return a <file-system> data structure describing the file system | |
675 | mounted at FILE." | |
26ffb693 LC |
676 | (let*-values (((stat) (make-bytevector sizeof-statfs)) |
677 | ((ret err) (proc (string->pointer file) | |
678 | (bytevector->pointer stat)))) | |
a1f70878 | 679 | (if (zero? ret) |
96f2a432 | 680 | (read-statfs stat) |
a1f70878 LC |
681 | (throw 'system-error "statfs" "~A: ~A" |
682 | (list file (strerror err)) | |
683 | (list err))))))) | |
684 | ||
65f224dc LC |
685 | (define (free-disk-space file) |
686 | "Return the free disk space, in bytes, on the file system that hosts FILE." | |
687 | (let ((fs (statfs file))) | |
688 | (* (file-system-block-size fs) | |
689 | (file-system-blocks-available fs)))) | |
690 | ||
25c7ff6a LC |
691 | ;; Flags for the *at command, notably the 'utime' procedure of libguile. |
692 | ;; From <fcntl.h>. | |
456c7ade LC |
693 | (define-as-needed AT_FDCWD -100) |
694 | (define-as-needed AT_SYMLINK_NOFOLLOW #x100) | |
695 | (define-as-needed AT_REMOVEDIR #x200) | |
696 | (define-as-needed AT_SYMLINK_FOLLOW #x400) | |
697 | (define-as-needed AT_NO_AUTOMOUNT #x800) | |
698 | (define-as-needed AT_EMPTY_PATH #x1000) | |
25c7ff6a | 699 | |
b08bea04 MO |
700 | (define-syntax BLKRRPART ;<sys/mount.h> |
701 | (identifier-syntax #x125F)) | |
702 | ||
703 | (define* (device-in-use? device) | |
704 | "Return #t if the block DEVICE is in use, #f otherwise. This is inspired | |
88401314 | 705 | from fdisk_device_is_used function of util-linux. This is particularly useful |
b08bea04 MO |
706 | for devices that do not appear in /proc/self/mounts like overlayfs lowerdir |
707 | backend device." | |
a1f5dfc2 LC |
708 | (let*-values (((fd) (open-fdes device O_RDONLY)) |
709 | ((ret err) (%ioctl fd BLKRRPART %null-pointer))) | |
710 | (close-fdes fd) | |
b08bea04 MO |
711 | (cond |
712 | ((= ret 0) | |
713 | #f) | |
714 | ((= err EBUSY) | |
715 | #t) | |
07758945 LC |
716 | ((= err EINVAL) |
717 | ;; We get EINVAL for devices that have the GENHD_FL_NO_PART_SCAN flag | |
718 | ;; set in the kernel, in particular loopback devices, though we do seem | |
719 | ;; to get it for SCSI storage (/dev/sr0) on QEMU. | |
720 | #f) | |
b08bea04 MO |
721 | (else |
722 | (throw 'system-error "ioctl" "~A" | |
723 | (list (strerror err)) | |
724 | (list err)))))) | |
725 | ||
73f38d5f | 726 | \f |
5e5f7167 LC |
727 | ;;; |
728 | ;;; Random. | |
729 | ;;; | |
730 | ||
731 | ;; From <uapi/linux/random.h>. | |
732 | (define RNDADDTOENTCNT #x40045201) | |
733 | ||
734 | (define (add-to-entropy-count port-or-fd n) | |
735 | "Add N to the kernel's entropy count (the value that can be read from | |
736 | /proc/sys/kernel/random/entropy_avail). PORT-OR-FD must correspond to | |
737 | /dev/urandom or /dev/random. Raise to 'system-error with EPERM when the | |
738 | caller lacks root privileges." | |
739 | (let ((fd (if (port? port-or-fd) | |
740 | (fileno port-or-fd) | |
741 | port-or-fd)) | |
742 | (box (make-bytevector (sizeof int)))) | |
743 | (bytevector-sint-set! box 0 n (native-endianness) | |
744 | (sizeof int)) | |
745 | (let-values (((ret err) | |
746 | (%ioctl fd RNDADDTOENTCNT | |
747 | (bytevector->pointer box)))) | |
748 | (unless (zero? err) | |
749 | (throw 'system-error "add-to-entropy-count" "~A" | |
750 | (list (strerror err)) | |
751 | (list err)))))) | |
752 | ||
753 | \f | |
73f38d5f LC |
754 | ;;; |
755 | ;;; Containers. | |
756 | ;;; | |
757 | ||
8950ed11 | 758 | ;; Linux clone flags, from linux/sched.h |
ee78d024 DT |
759 | (define CLONE_CHILD_CLEARTID #x00200000) |
760 | (define CLONE_CHILD_SETTID #x01000000) | |
761 | (define CLONE_NEWNS #x00020000) | |
762 | (define CLONE_NEWUTS #x04000000) | |
763 | (define CLONE_NEWIPC #x08000000) | |
764 | (define CLONE_NEWUSER #x10000000) | |
765 | (define CLONE_NEWPID #x20000000) | |
766 | (define CLONE_NEWNET #x40000000) | |
8950ed11 | 767 | |
a65177a6 LC |
768 | (define %set-automatic-finalization-enabled?! |
769 | ;; When using a statically-linked Guile, for instance in the initrd, we | |
770 | ;; cannot resolve this symbol, but most of the time we don't need it | |
771 | ;; anyway. Thus, delay it. | |
772 | (let ((proc (delay | |
773 | (pointer->procedure int | |
774 | (dynamic-func | |
775 | "scm_set_automatic_finalization_enabled" | |
776 | (dynamic-link)) | |
777 | (list int))))) | |
778 | (lambda (enabled?) | |
779 | "Switch on or off automatic finalization in a separate thread. | |
70dfdd50 | 780 | Turning finalization off shuts down the finalization thread as a side effect." |
a65177a6 LC |
781 | (->bool ((force proc) (if enabled? 1 0)))))) |
782 | ||
783 | (define-syntax-rule (without-automatic-finalization exp) | |
784 | "Turn off automatic finalization within the dynamic extent of EXP." | |
785 | (let ((enabled? #t)) | |
786 | (dynamic-wind | |
787 | (lambda () | |
788 | (set! enabled? (%set-automatic-finalization-enabled?! #f))) | |
789 | (lambda () | |
790 | exp) | |
791 | (lambda () | |
792 | (%set-automatic-finalization-enabled?! enabled?))))) | |
70dfdd50 | 793 | |
8950ed11 | 794 | ;; The libc interface to sys_clone is not useful for Scheme programs, so the |
0e3cc311 LC |
795 | ;; low-level system call is wrapped instead. The 'syscall' function is |
796 | ;; declared in <unistd.h> as a variadic function; in practice, it expects 6 | |
797 | ;; pointer-sized arguments, as shown in, e.g., x86_64/syscall.S. | |
8950ed11 | 798 | (define clone |
4f8cede0 MW |
799 | (let* ((proc (syscall->procedure int "syscall" |
800 | (list long ;sysno | |
801 | unsigned-long ;flags | |
802 | '* '* '* | |
803 | '*))) | |
8950ed11 DT |
804 | ;; TODO: Don't do this. |
805 | (syscall-id (match (utsname:machine (uname)) | |
806 | ("i686" 120) | |
807 | ("x86_64" 56) | |
808 | ("mips64" 5055) | |
4f8cede0 | 809 | ("armv7l" 120) |
7f0bb654 | 810 | ("aarch64" 220) |
4f8cede0 | 811 | (_ #f)))) |
8950ed11 DT |
812 | (lambda (flags) |
813 | "Create a new child process by duplicating the current parent process. | |
814 | Unlike the fork system call, clone accepts FLAGS that specify which resources | |
815 | are shared between the parent and child processes." | |
26ffb693 | 816 | (let-values (((ret err) |
70dfdd50 LC |
817 | ;; Guile 2.2 runs a finalization thread. 'primitive-fork' |
818 | ;; takes care of shutting it down before forking, and we | |
819 | ;; must do the same here. Failing to do that, if the | |
820 | ;; child process calls 'primitive-fork', it will hang | |
821 | ;; while trying to pthread_join the finalization thread | |
822 | ;; since that thread does not exist. | |
823 | (without-automatic-finalization | |
824 | (proc syscall-id flags | |
825 | %null-pointer ;child stack | |
826 | %null-pointer %null-pointer ;ptid & ctid | |
827 | %null-pointer)))) ;unused | |
cf897cba DT |
828 | (if (= ret -1) |
829 | (throw 'system-error "clone" "~d: ~A" | |
830 | (list flags (strerror err)) | |
831 | (list err)) | |
832 | ret))))) | |
8950ed11 | 833 | |
43ace6ea | 834 | (define setns |
39e336b5 DT |
835 | ;; Some systems may be using an old (pre-2.14) version of glibc where there |
836 | ;; is no 'setns' function available. | |
837 | (false-if-exception | |
d1f33ba4 | 838 | (let ((proc (syscall->procedure int "setns" (list int int)))) |
39e336b5 DT |
839 | (lambda (fdes nstype) |
840 | "Reassociate the current process with the namespace specified by FDES, a | |
43ace6ea DT |
841 | file descriptor obtained by opening a /proc/PID/ns/* file. NSTYPE specifies |
842 | which type of namespace the current process may be reassociated with, or 0 if | |
843 | there is no such limitation." | |
26ffb693 | 844 | (let-values (((ret err) (proc fdes nstype))) |
39e336b5 DT |
845 | (unless (zero? ret) |
846 | (throw 'system-error "setns" "~d ~d: ~A" | |
847 | (list fdes nstype (strerror err)) | |
848 | (list err)))))))) | |
43ace6ea | 849 | |
df3ce5c1 | 850 | (define pivot-root |
4f8cede0 | 851 | (let ((proc (syscall->procedure int "pivot_root" (list '* '*)))) |
df3ce5c1 DT |
852 | (lambda (new-root put-old) |
853 | "Change the root file system to NEW-ROOT and move the current root file | |
854 | system to PUT-OLD." | |
26ffb693 LC |
855 | (let-values (((ret err) |
856 | (proc (string->pointer new-root) | |
857 | (string->pointer put-old)))) | |
df3ce5c1 DT |
858 | (unless (zero? ret) |
859 | (throw 'system-error "pivot_root" "~S ~S: ~A" | |
860 | (list new-root put-old (strerror err)) | |
861 | (list err))))))) | |
862 | ||
7585016f | 863 | \f |
fa73c193 LC |
864 | ;;; |
865 | ;;; Opendir & co. | |
866 | ;;; | |
867 | ||
1ab9e483 LC |
868 | (define (file-type->symbol type) |
869 | ;; Convert TYPE to symbols like 'stat:type' does. | |
870 | (cond ((= type DT_REG) 'regular) | |
871 | ((= type DT_LNK) 'symlink) | |
872 | ((= type DT_DIR) 'directory) | |
873 | ((= type DT_FIFO) 'fifo) | |
874 | ((= type DT_CHR) 'char-special) | |
875 | ((= type DT_BLK) 'block-special) | |
876 | ((= type DT_SOCK) 'socket) | |
877 | (else 'unknown))) | |
878 | ||
879 | ;; 'struct dirent64' for GNU/Linux. | |
880 | (define-c-struct %struct-dirent-header/linux | |
881 | sizeof-dirent-header/linux | |
fa73c193 | 882 | (lambda (inode offset length type name) |
1ab9e483 LC |
883 | `((type . ,(file-type->symbol type)) |
884 | (inode . ,inode))) | |
885 | read-dirent-header/linux | |
886 | write-dirent-header!/linux | |
fa73c193 LC |
887 | (inode int64) |
888 | (offset int64) | |
889 | (length unsigned-short) | |
890 | (type uint8) | |
891 | (name uint8)) ;first byte of 'd_name' | |
892 | ||
1ab9e483 LC |
893 | ;; 'struct dirent64' for GNU/Hurd. |
894 | (define-c-struct %struct-dirent-header/hurd | |
895 | sizeof-dirent-header/hurd | |
896 | (lambda (inode length type name-length name) | |
897 | `((type . ,(file-type->symbol type)) | |
898 | (inode . ,inode))) | |
899 | read-dirent-header/hurd | |
900 | write-dirent-header!/hurd | |
901 | (inode int64) | |
902 | (length unsigned-short) | |
903 | (type uint8) | |
904 | (namelen uint8) | |
905 | (name uint8)) | |
906 | ||
fa73c193 LC |
907 | ;; Constants for the 'type' field, from <dirent.h>. |
908 | (define DT_UNKNOWN 0) | |
909 | (define DT_FIFO 1) | |
910 | (define DT_CHR 2) | |
911 | (define DT_DIR 4) | |
912 | (define DT_BLK 6) | |
913 | (define DT_REG 8) | |
914 | (define DT_LNK 10) | |
915 | (define DT_SOCK 12) | |
916 | (define DT_WHT 14) | |
917 | ||
918 | (define string->pointer/utf-8 | |
919 | (cut string->pointer <> "UTF-8")) | |
920 | ||
921 | (define pointer->string/utf-8 | |
922 | (cut pointer->string <> <> "UTF-8")) | |
923 | ||
924 | (define opendir* | |
925 | (let ((proc (syscall->procedure '* "opendir" '(*)))) | |
926 | (lambda* (name #:optional (string->pointer string->pointer/utf-8)) | |
927 | (let-values (((ptr err) | |
928 | (proc (string->pointer name)))) | |
929 | (if (null-pointer? ptr) | |
930 | (throw 'system-error "opendir*" | |
3bacc655 | 931 | "~A: ~A" (list name (strerror err)) |
fa73c193 LC |
932 | (list err)) |
933 | ptr))))) | |
934 | ||
935 | (define closedir* | |
936 | (let ((proc (syscall->procedure int "closedir" '(*)))) | |
937 | (lambda (directory) | |
938 | (let-values (((ret err) | |
939 | (proc directory))) | |
940 | (unless (zero? ret) | |
941 | (throw 'system-error "closedir" | |
942 | "closedir: ~A" (list (strerror err)) | |
943 | (list err))))))) | |
944 | ||
82d8959e LC |
945 | (define (readdir-procedure name-field-offset sizeof-dirent-header |
946 | read-dirent-header) | |
fa73c193 LC |
947 | (let ((proc (syscall->procedure '* "readdir64" '(*)))) |
948 | (lambda* (directory #:optional (pointer->string pointer->string/utf-8)) | |
949 | (let ((ptr (proc directory))) | |
950 | (and (not (null-pointer? ptr)) | |
951 | (cons (pointer->string | |
82d8959e | 952 | (make-pointer (+ (pointer-address ptr) name-field-offset)) |
fa73c193 LC |
953 | -1) |
954 | (read-dirent-header | |
955 | (pointer->bytevector ptr sizeof-dirent-header)))))))) | |
956 | ||
82d8959e LC |
957 | (define readdir* |
958 | ;; Decide at run time which one must be used. | |
fd546bbb | 959 | (if (string-contains %host-type "linux-gnu") |
82d8959e LC |
960 | (readdir-procedure (c-struct-field-offset %struct-dirent-header/linux |
961 | name) | |
962 | sizeof-dirent-header/linux | |
963 | read-dirent-header/linux) | |
964 | (readdir-procedure (c-struct-field-offset %struct-dirent-header/hurd | |
965 | name) | |
966 | sizeof-dirent-header/hurd | |
967 | read-dirent-header/hurd))) | |
968 | ||
fa73c193 LC |
969 | (define* (scandir* name #:optional |
970 | (select? (const #t)) | |
971 | (entry<? (lambda (entry1 entry2) | |
972 | (match entry1 | |
973 | ((name1 . _) | |
974 | (match entry2 | |
975 | ((name2 . _) | |
976 | (string<? name1 name2))))))) | |
977 | #:key | |
978 | (string->pointer string->pointer/utf-8) | |
979 | (pointer->string pointer->string/utf-8)) | |
980 | "This procedure improves on Guile's 'scandir' procedure in several ways: | |
981 | ||
982 | 1. Systematically encode decode file names using STRING->POINTER and | |
983 | POINTER->STRING (UTF-8 by default; this works around a defect in Guile 2.0/2.2 | |
984 | where 'scandir' decodes file names according to the current locale, which is | |
985 | not always desirable. | |
986 | ||
987 | 2. Each entry that is returned has the form (NAME . PROPERTIES). | |
988 | PROPERTIES is an alist showing additional properties about the entry, as | |
989 | found in 'struct dirent'. An entry may look like this: | |
990 | ||
991 | (\"foo.scm\" (type . regular) (inode . 123456)) | |
992 | ||
993 | Callers must be prepared to deal with the case where 'type' is 'unknown' | |
994 | since some file systems do not provide that information. | |
995 | ||
996 | 3. Raise to 'system-error' when NAME cannot be opened." | |
997 | (let ((directory (opendir* name string->pointer))) | |
998 | (dynamic-wind | |
999 | (const #t) | |
1000 | (lambda () | |
1001 | (let loop ((result '())) | |
1002 | (match (readdir* directory pointer->string) | |
1003 | (#f | |
1004 | (sort result entry<?)) | |
1005 | (entry | |
1006 | (loop (if (select? entry) | |
1007 | (cons entry result) | |
1008 | result)))))) | |
1009 | (lambda () | |
1010 | (closedir* directory))))) | |
1011 | ||
1012 | \f | |
4e0ea3eb LC |
1013 | ;;; |
1014 | ;;; Advisory file locking. | |
1015 | ;;; | |
1016 | ||
d33c8b46 LC |
1017 | (define-c-struct %struct-flock ;<fcntl.h> |
1018 | sizeof-flock | |
1019 | list | |
1020 | read-flock | |
1021 | write-flock! | |
1022 | (type short) | |
1023 | (whence short) | |
1024 | (start size_t) | |
1025 | (length size_t) | |
1026 | (pid int)) | |
4e0ea3eb LC |
1027 | |
1028 | (define F_SETLKW | |
1029 | ;; On Linux-based systems, this is usually 7, but not always | |
1030 | ;; (exceptions include SPARC.) On GNU/Hurd, it's 9. | |
1031 | (cond ((string-contains %host-type "sparc") 9) ; sparc-*-linux-gnu | |
1032 | ((string-contains %host-type "linux") 7) ; *-linux-gnu | |
1033 | (else 9))) ; *-gnu* | |
1034 | ||
1035 | (define F_SETLK | |
1036 | ;; Likewise: GNU/Hurd and SPARC use 8, while the others typically use 6. | |
1037 | (cond ((string-contains %host-type "sparc") 8) ; sparc-*-linux-gnu | |
1038 | ((string-contains %host-type "linux") 6) ; *-linux-gnu | |
1039 | (else 8))) ; *-gnu* | |
1040 | ||
1041 | (define F_xxLCK | |
1042 | ;; The F_RDLCK, F_WRLCK, and F_UNLCK constants. | |
1043 | (cond ((string-contains %host-type "sparc") #(1 2 3)) ; sparc-*-linux-gnu | |
1044 | ((string-contains %host-type "hppa") #(1 2 3)) ; hppa-*-linux-gnu | |
1045 | ((string-contains %host-type "linux") #(0 1 2)) ; *-linux-gnu | |
1046 | (else #(1 2 3)))) ; *-gnu* | |
1047 | ||
1048 | (define fcntl-flock | |
1049 | (let ((proc (syscall->procedure int "fcntl" `(,int ,int *)))) | |
1050 | (lambda* (fd-or-port operation #:key (wait? #t)) | |
1051 | "Perform locking OPERATION on the file beneath FD-OR-PORT. OPERATION | |
1052 | must be a symbol, one of 'read-lock, 'write-lock, or 'unlock. When WAIT? is | |
1053 | true, block until the lock is acquired; otherwise, thrown an 'flock-error' | |
1054 | exception if it's already taken." | |
1055 | (define (operation->int op) | |
1056 | (case op | |
1057 | ((read-lock) (vector-ref F_xxLCK 0)) | |
1058 | ((write-lock) (vector-ref F_xxLCK 1)) | |
1059 | ((unlock) (vector-ref F_xxLCK 2)) | |
1060 | (else (error "invalid fcntl-flock operation" op)))) | |
1061 | ||
1062 | (define fd | |
1063 | (if (port? fd-or-port) | |
1064 | (fileno fd-or-port) | |
1065 | fd-or-port)) | |
1066 | ||
d33c8b46 LC |
1067 | (define bv |
1068 | (make-bytevector sizeof-flock)) | |
1069 | ||
1070 | (write-flock! bv 0 | |
1071 | (operation->int operation) SEEK_SET | |
1072 | 0 0 ;whole file | |
1073 | 0) | |
1074 | ||
4e0ea3eb LC |
1075 | ;; XXX: 'fcntl' is a vararg function, but here we happily use the |
1076 | ;; standard ABI; crossing fingers. | |
26ffb693 LC |
1077 | (let-values (((ret err) |
1078 | (proc fd | |
1079 | (if wait? | |
1080 | F_SETLKW ;lock & wait | |
1081 | F_SETLK) ;non-blocking attempt | |
1082 | (bytevector->pointer bv)))) | |
d33c8b46 LC |
1083 | (unless (zero? ret) |
1084 | ;; Presumably we got EAGAIN or so. | |
1085 | (throw 'flock-error err)))))) | |
4e0ea3eb | 1086 | |
f49e9131 | 1087 | (define* (lock-file file #:key (wait? #t)) |
b7178c22 LC |
1088 | "Wait and acquire an exclusive lock on FILE. Return an open port." |
1089 | (let ((port (open-file file "w0"))) | |
f49e9131 | 1090 | (fcntl-flock port 'write-lock #:wait? wait?) |
b7178c22 LC |
1091 | port)) |
1092 | ||
1093 | (define (unlock-file port) | |
1094 | "Unlock PORT, a port returned by 'lock-file'." | |
1095 | (fcntl-flock port 'unlock) | |
1096 | (close-port port) | |
1097 | #t) | |
1098 | ||
89ceb86a | 1099 | (define (call-with-file-lock file thunk) |
9a067fe7 | 1100 | (let ((port #f)) |
b7178c22 LC |
1101 | (dynamic-wind |
1102 | (lambda () | |
9a067fe7 LC |
1103 | (set! port |
1104 | (catch 'system-error | |
1105 | (lambda () | |
1106 | (lock-file file)) | |
1107 | (lambda args | |
1108 | ;; When using the statically-linked Guile in the initrd, | |
1109 | ;; 'fcntl-flock' returns ENOSYS unconditionally. Ignore | |
1110 | ;; that error since we're typically the only process running | |
1111 | ;; at this point. | |
1112 | (if (= ENOSYS (system-error-errno args)) | |
1113 | #f | |
1114 | (apply throw args)))))) | |
89ceb86a | 1115 | thunk |
b7178c22 | 1116 | (lambda () |
5f0cf1df LC |
1117 | (when port |
1118 | (unlock-file port)))))) | |
b7178c22 | 1119 | |
f49e9131 | 1120 | (define (call-with-file-lock/no-wait file thunk handler) |
9a067fe7 | 1121 | (let ((port #f)) |
f49e9131 JL |
1122 | (dynamic-wind |
1123 | (lambda () | |
9a067fe7 LC |
1124 | (set! port |
1125 | (catch #t | |
1126 | (lambda () | |
1127 | (lock-file file #:wait? #f)) | |
1128 | (lambda (key . args) | |
1129 | (match key | |
1130 | ('flock-error | |
1131 | (apply handler args) | |
1132 | ;; No open port to the lock, so return #f. | |
1133 | #f) | |
1134 | ('system-error | |
1135 | ;; When using the statically-linked Guile in the initrd, | |
1136 | ;; 'fcntl-flock' returns ENOSYS unconditionally. Ignore | |
1137 | ;; that error since we're typically the only process running | |
1138 | ;; at this point. | |
1139 | (if (= ENOSYS (system-error-errno (cons key args))) | |
1140 | #f | |
1141 | (apply throw key args))) | |
1142 | (_ (apply throw key args))))))) | |
f49e9131 JL |
1143 | thunk |
1144 | (lambda () | |
1145 | (when port | |
1146 | (unlock-file port)))))) | |
1147 | ||
89ceb86a LC |
1148 | (define-syntax-rule (with-file-lock file exp ...) |
1149 | "Wait to acquire a lock on FILE and evaluate EXP in that context." | |
1150 | (call-with-file-lock file (lambda () exp ...))) | |
1151 | ||
f49e9131 JL |
1152 | (define-syntax-rule (with-file-lock/no-wait file handler exp ...) |
1153 | "Try to acquire a lock on FILE and evaluate EXP in that context. Execute | |
1154 | handler if the lock is already held by another process." | |
1155 | (call-with-file-lock/no-wait file (lambda () exp ...) handler)) | |
1156 | ||
4e0ea3eb | 1157 | \f |
aa401f9b LC |
1158 | ;;; |
1159 | ;;; Miscellaneous, aka. 'prctl'. | |
1160 | ;;; | |
1161 | ||
1162 | (define %prctl | |
1163 | ;; Should it win the API contest against 'ioctl'? You tell us! | |
1164 | (syscall->procedure int "prctl" | |
1165 | (list int unsigned-long unsigned-long | |
1166 | unsigned-long unsigned-long))) | |
1167 | ||
1168 | (define PR_SET_NAME 15) ;<linux/prctl.h> | |
1169 | (define PR_GET_NAME 16) | |
1170 | ||
1171 | (define %max-thread-name-length | |
1172 | ;; Maximum length in bytes of the process name, including the terminating | |
1173 | ;; zero. | |
1174 | 16) | |
1175 | ||
1176 | (define (set-thread-name name) | |
1177 | "Set the name of the calling thread to NAME. NAME is truncated to 15 | |
1178 | bytes." | |
1179 | (let ((ptr (string->pointer name))) | |
1180 | (let-values (((ret err) | |
1181 | (%prctl PR_SET_NAME | |
1182 | (pointer-address ptr) 0 0 0))) | |
1183 | (unless (zero? ret) | |
1184 | (throw 'set-process-name "set-process-name" | |
1185 | "set-process-name: ~A" | |
1186 | (list (strerror err)) | |
1187 | (list err)))))) | |
1188 | ||
1189 | (define (thread-name) | |
1190 | "Return the name of the calling thread as a string." | |
1191 | (let ((buf (make-bytevector %max-thread-name-length))) | |
1192 | (let-values (((ret err) | |
1193 | (%prctl PR_GET_NAME | |
1194 | (pointer-address (bytevector->pointer buf)) | |
1195 | 0 0 0))) | |
1196 | (if (zero? ret) | |
1197 | (bytes->string (bytevector->u8-list buf)) | |
1198 | (throw 'process-name "process-name" | |
1199 | "process-name: ~A" | |
1200 | (list (strerror err)) | |
1201 | (list err)))))) | |
1202 | ||
1203 | \f | |
7585016f LC |
1204 | ;;; |
1205 | ;;; Network interfaces. | |
1206 | ;;; | |
1207 | ||
1208 | (define SIOCGIFCONF ;from <bits/ioctls.h> | |
598be42d JN |
1209 | ; <net/if.h> |
1210 | ; <hurd/ioctl.h> | |
7585016f LC |
1211 | (if (string-contains %host-type "linux") |
1212 | #x8912 ;GNU/Linux | |
1213 | #xf00801a4)) ;GNU/Hurd | |
973eea34 LC |
1214 | (define SIOCGIFFLAGS |
1215 | (if (string-contains %host-type "linux") | |
1216 | #x8913 ;GNU/Linux | |
1217 | #xc4804191)) ;GNU/Hurd | |
c9bf64d6 LC |
1218 | (define SIOCSIFFLAGS |
1219 | (if (string-contains %host-type "linux") | |
1220 | #x8914 ;GNU/Linux | |
598be42d | 1221 | #x84804190)) ;GNU/Hurd |
c9bf64d6 LC |
1222 | (define SIOCGIFADDR |
1223 | (if (string-contains %host-type "linux") | |
1224 | #x8915 ;GNU/Linux | |
598be42d | 1225 | #xc08401a1)) ;GNU/Hurd |
c9bf64d6 LC |
1226 | (define SIOCSIFADDR |
1227 | (if (string-contains %host-type "linux") | |
1228 | #x8916 ;GNU/Linux | |
598be42d | 1229 | #x8084018c)) ;GNU/Hurd |
67e5f3b7 LC |
1230 | (define SIOCGIFNETMASK |
1231 | (if (string-contains %host-type "linux") | |
1232 | #x891b ;GNU/Linux | |
598be42d | 1233 | #xc08401a5)) ;GNU/Hurd |
67e5f3b7 LC |
1234 | (define SIOCSIFNETMASK |
1235 | (if (string-contains %host-type "linux") | |
1236 | #x891c ;GNU/Linux | |
598be42d | 1237 | #x80840196)) ;GNU/Hurd |
9e38e3cf LC |
1238 | (define SIOCADDRT |
1239 | (if (string-contains %host-type "linux") | |
1240 | #x890B ;GNU/Linux | |
1241 | -1)) ;FIXME: GNU/Hurd? | |
1242 | (define SIOCDELRT | |
1243 | (if (string-contains %host-type "linux") | |
1244 | #x890C ;GNU/Linux | |
1245 | -1)) ;FIXME: GNU/Hurd? | |
973eea34 LC |
1246 | |
1247 | ;; Flags and constants from <net/if.h>. | |
1248 | ||
c5cd4fad MO |
1249 | (define-as-needed IFF_UP #x1) ;Interface is up |
1250 | (define-as-needed IFF_BROADCAST #x2) ;Broadcast address valid. | |
1251 | (define-as-needed IFF_LOOPBACK #x8) ;Is a loopback net. | |
0bc6fe32 | 1252 | (define-as-needed IFF_RUNNING #x40) ;interface RFC2863 OPER_UP |
5f5499d6 | 1253 | (define-as-needed IFF_NOARP #x80) ;ARP disabled or unsupported |
973eea34 LC |
1254 | |
1255 | (define IF_NAMESIZE 16) ;maximum interface name size | |
7585016f | 1256 | |
9d9d0c9c LC |
1257 | (define-c-struct %ifconf-struct |
1258 | sizeof-ifconf | |
1259 | list | |
1260 | read-ifconf | |
1261 | write-ifconf! | |
1262 | (length int) ;int ifc_len | |
1263 | (request '*)) ;struct ifreq *ifc_ifcu | |
7585016f LC |
1264 | |
1265 | (define ifreq-struct-size | |
973eea34 LC |
1266 | ;; 'struct ifreq' begins with an array of IF_NAMESIZE bytes containing the |
1267 | ;; interface name (nul-terminated), followed by a bunch of stuff. This is | |
1268 | ;; its size in bytes. | |
7585016f LC |
1269 | (if (= 8 (sizeof '*)) |
1270 | 40 | |
1271 | 32)) | |
1272 | ||
c9bf64d6 | 1273 | (define-c-struct sockaddr-in ;<linux/in.h> |
785cfa87 | 1274 | sizeof-sockaddrin |
13f0c6ed LC |
1275 | (lambda (family port address) |
1276 | (make-socket-address family address port)) | |
c9bf64d6 LC |
1277 | read-sockaddr-in |
1278 | write-sockaddr-in! | |
1279 | (family unsigned-short) | |
1280 | (port (int16 ~ big)) | |
1281 | (address (int32 ~ big))) | |
1282 | ||
1283 | (define-c-struct sockaddr-in6 ;<linux/in6.h> | |
785cfa87 | 1284 | sizeof-sockaddr-in6 |
13f0c6ed LC |
1285 | (lambda (family port flowinfo address scopeid) |
1286 | (make-socket-address family address port flowinfo scopeid)) | |
c9bf64d6 LC |
1287 | read-sockaddr-in6 |
1288 | write-sockaddr-in6! | |
1289 | (family unsigned-short) | |
1290 | (port (int16 ~ big)) | |
1291 | (flowinfo (int32 ~ big)) | |
1292 | (address (int128 ~ big)) | |
1293 | (scopeid int32)) | |
1294 | ||
1295 | (define (write-socket-address! sockaddr bv index) | |
1296 | "Write SOCKADDR, a socket address as returned by 'make-socket-address', to | |
1297 | bytevector BV at INDEX." | |
1298 | (let ((family (sockaddr:fam sockaddr))) | |
1299 | (cond ((= family AF_INET) | |
1300 | (write-sockaddr-in! bv index | |
1301 | family | |
1302 | (sockaddr:port sockaddr) | |
1303 | (sockaddr:addr sockaddr))) | |
1304 | ((= family AF_INET6) | |
1305 | (write-sockaddr-in6! bv index | |
1306 | family | |
1307 | (sockaddr:port sockaddr) | |
1308 | (sockaddr:flowinfo sockaddr) | |
1309 | (sockaddr:addr sockaddr) | |
1310 | (sockaddr:scopeid sockaddr))) | |
1311 | (else | |
1312 | (error "unsupported socket address" sockaddr))))) | |
1313 | ||
3ca33769 LC |
1314 | (define PF_PACKET 17) ;<bits/socket.h> |
1315 | (define AF_PACKET PF_PACKET) | |
1316 | ||
1317 | (define* (read-socket-address bv #:optional (index 0)) | |
c9bf64d6 LC |
1318 | "Read a socket address from bytevector BV at INDEX." |
1319 | (let ((family (bytevector-u16-native-ref bv index))) | |
1320 | (cond ((= family AF_INET) | |
13f0c6ed | 1321 | (read-sockaddr-in bv index)) |
c9bf64d6 | 1322 | ((= family AF_INET6) |
13f0c6ed | 1323 | (read-sockaddr-in6 bv index)) |
c9bf64d6 | 1324 | (else |
3ca33769 LC |
1325 | ;; XXX: Unsupported address family, such as AF_PACKET. Return a |
1326 | ;; vector such that the vector can at least call 'sockaddr:fam'. | |
1327 | (vector family))))) | |
c9bf64d6 | 1328 | |
7585016f LC |
1329 | (define %ioctl |
1330 | ;; The most terrible interface, live from Scheme. | |
d1f33ba4 | 1331 | (syscall->procedure int "ioctl" (list int unsigned-long '*))) |
7585016f | 1332 | |
57f068be LC |
1333 | (define (bytes->string bytes) |
1334 | "Read BYTES, a list of bytes, and return the null-terminated string decoded | |
1335 | from there, or #f if that would be an empty string." | |
1336 | (match (take-while (negate zero?) bytes) | |
1337 | (() | |
1338 | #f) | |
1339 | (non-zero | |
1340 | (list->string (map integer->char non-zero))))) | |
1341 | ||
7585016f LC |
1342 | (define (bytevector->string-list bv stride len) |
1343 | "Return the null-terminated strings found in BV every STRIDE bytes. Read at | |
1344 | most LEN bytes from BV." | |
1345 | (let loop ((bytes (take (bytevector->u8-list bv) | |
1346 | (min len (bytevector-length bv)))) | |
1347 | (result '())) | |
1348 | (match bytes | |
1349 | (() | |
1350 | (reverse result)) | |
1351 | (_ | |
1352 | (loop (drop bytes stride) | |
57f068be | 1353 | (cons (bytes->string bytes) result)))))) |
7585016f | 1354 | |
b89e7405 LC |
1355 | (define* (network-interface-names #:optional sock) |
1356 | "Return the names of existing network interfaces. This is typically limited | |
4d54785c | 1357 | to interfaces that are currently up." |
7585016f LC |
1358 | (let* ((close? (not sock)) |
1359 | (sock (or sock (socket SOCK_STREAM AF_INET 0))) | |
1360 | (len (* ifreq-struct-size 10)) | |
1361 | (reqs (make-bytevector len)) | |
9d9d0c9c LC |
1362 | (conf (make-bytevector sizeof-ifconf))) |
1363 | (write-ifconf! conf 0 | |
1364 | len (bytevector->pointer reqs)) | |
1365 | ||
26ffb693 | 1366 | (let-values (((ret err) |
9d9d0c9c LC |
1367 | (%ioctl (fileno sock) SIOCGIFCONF |
1368 | (bytevector->pointer conf)))) | |
26ffb693 LC |
1369 | (when close? |
1370 | (close-port sock)) | |
1371 | (if (zero? ret) | |
1372 | (bytevector->string-list reqs ifreq-struct-size | |
9d9d0c9c | 1373 | (match (read-ifconf conf) |
26ffb693 LC |
1374 | ((len . _) len))) |
1375 | (throw 'system-error "network-interface-list" | |
1376 | "network-interface-list: ~A" | |
1377 | (list (strerror err)) | |
1378 | (list err)))))) | |
7585016f | 1379 | |
4d54785c LC |
1380 | (define %interface-line |
1381 | ;; Regexp matching an interface line in Linux's /proc/net/dev. | |
a220b262 | 1382 | (make-regexp "^[[:blank:]]*([[:graph:]]+):.*$")) |
4d54785c | 1383 | |
b89e7405 LC |
1384 | (define (all-network-interface-names) |
1385 | "Return all the names of the registered network interfaces, including those | |
1386 | that are not up." | |
4d54785c LC |
1387 | (call-with-input-file "/proc/net/dev" ;XXX: Linux-specific |
1388 | (lambda (port) | |
1389 | (let loop ((interfaces '())) | |
1390 | (let ((line (read-line port))) | |
1391 | (cond ((eof-object? line) | |
1392 | (reverse interfaces)) | |
1393 | ((regexp-exec %interface-line line) | |
1394 | => | |
1395 | (lambda (match) | |
1396 | (loop (cons (match:substring match 1) interfaces)))) | |
1397 | (else | |
1398 | (loop interfaces)))))))) | |
1399 | ||
c5cd4fad | 1400 | (define-as-needed (network-interface-flags socket name) |
973eea34 LC |
1401 | "Return a number that is the bit-wise or of 'IFF*' flags for network |
1402 | interface NAME." | |
1403 | (let ((req (make-bytevector ifreq-struct-size))) | |
1404 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1405 | (min (string-length name) (- IF_NAMESIZE 1))) | |
26ffb693 LC |
1406 | (let-values (((ret err) |
1407 | (%ioctl (fileno socket) SIOCGIFFLAGS | |
1408 | (bytevector->pointer req)))) | |
973eea34 LC |
1409 | (if (zero? ret) |
1410 | ||
c5cd4fad MO |
1411 | ;; The 'ifr_flags' field is IF_NAMESIZE bytes after the |
1412 | ;; beginning of 'struct ifreq', and it's a short int. | |
973eea34 LC |
1413 | (bytevector-sint-ref req IF_NAMESIZE (native-endianness) |
1414 | (sizeof short)) | |
1415 | ||
1416 | (throw 'system-error "network-interface-flags" | |
1417 | "network-interface-flags on ~A: ~A" | |
1418 | (list name (strerror err)) | |
1419 | (list err)))))) | |
1420 | ||
1421 | (define (loopback-network-interface? name) | |
1422 | "Return true if NAME designates a loopback network interface." | |
1423 | (let* ((sock (socket SOCK_STREAM AF_INET 0)) | |
1424 | (flags (network-interface-flags sock name))) | |
1425 | (close-port sock) | |
1426 | (not (zero? (logand flags IFF_LOOPBACK))))) | |
1427 | ||
0bc6fe32 DM |
1428 | (define (network-interface-running? name) |
1429 | "Return true if NAME designates a running network interface." | |
1430 | (let* ((sock (socket SOCK_STREAM AF_INET 0)) | |
1431 | (flags (network-interface-flags sock name))) | |
1432 | (close-port sock) | |
1433 | (not (zero? (logand flags IFF_RUNNING))))) | |
1434 | ||
5f5499d6 MB |
1435 | (define (arp-network-interface? name) |
1436 | "Return true if NAME supports the Address Resolution Protocol." | |
1437 | (let* ((sock (socket SOCK_STREAM AF_INET 0)) | |
1438 | (flags (network-interface-flags sock name))) | |
1439 | (close-port sock) | |
1440 | (zero? (logand flags IFF_NOARP)))) | |
1441 | ||
c5cd4fad | 1442 | (define-as-needed (set-network-interface-flags socket name flags) |
c9bf64d6 LC |
1443 | "Set the flag of network interface NAME to FLAGS." |
1444 | (let ((req (make-bytevector ifreq-struct-size))) | |
1445 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1446 | (min (string-length name) (- IF_NAMESIZE 1))) | |
1447 | ;; Set the 'ifr_flags' field. | |
1448 | (bytevector-uint-set! req IF_NAMESIZE flags (native-endianness) | |
1449 | (sizeof short)) | |
26ffb693 LC |
1450 | (let-values (((ret err) |
1451 | (%ioctl (fileno socket) SIOCSIFFLAGS | |
1452 | (bytevector->pointer req)))) | |
c9bf64d6 LC |
1453 | (unless (zero? ret) |
1454 | (throw 'system-error "set-network-interface-flags" | |
1455 | "set-network-interface-flags on ~A: ~A" | |
1456 | (list name (strerror err)) | |
1457 | (list err)))))) | |
1458 | ||
c5cd4fad | 1459 | (define-as-needed (set-network-interface-address socket name sockaddr) |
c9bf64d6 LC |
1460 | "Set the address of network interface NAME to SOCKADDR." |
1461 | (let ((req (make-bytevector ifreq-struct-size))) | |
1462 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1463 | (min (string-length name) (- IF_NAMESIZE 1))) | |
1464 | ;; Set the 'ifr_addr' field. | |
1465 | (write-socket-address! sockaddr req IF_NAMESIZE) | |
26ffb693 LC |
1466 | (let-values (((ret err) |
1467 | (%ioctl (fileno socket) SIOCSIFADDR | |
1468 | (bytevector->pointer req)))) | |
c9bf64d6 LC |
1469 | (unless (zero? ret) |
1470 | (throw 'system-error "set-network-interface-address" | |
1471 | "set-network-interface-address on ~A: ~A" | |
1472 | (list name (strerror err)) | |
1473 | (list err)))))) | |
1474 | ||
67e5f3b7 LC |
1475 | (define (set-network-interface-netmask socket name sockaddr) |
1476 | "Set the network mask of interface NAME to SOCKADDR." | |
1477 | (let ((req (make-bytevector ifreq-struct-size))) | |
1478 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1479 | (min (string-length name) (- IF_NAMESIZE 1))) | |
1480 | ;; Set the 'ifr_addr' field. | |
1481 | (write-socket-address! sockaddr req IF_NAMESIZE) | |
1482 | (let-values (((ret err) | |
1483 | (%ioctl (fileno socket) SIOCSIFNETMASK | |
1484 | (bytevector->pointer req)))) | |
1485 | (unless (zero? ret) | |
1486 | (throw 'system-error "set-network-interface-netmask" | |
1487 | "set-network-interface-netmask on ~A: ~A" | |
1488 | (list name (strerror err)) | |
1489 | (list err)))))) | |
1490 | ||
c9bf64d6 LC |
1491 | (define (network-interface-address socket name) |
1492 | "Return the address of network interface NAME. The result is an object of | |
1493 | the same type as that returned by 'make-socket-address'." | |
1494 | (let ((req (make-bytevector ifreq-struct-size))) | |
1495 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1496 | (min (string-length name) (- IF_NAMESIZE 1))) | |
26ffb693 LC |
1497 | (let-values (((ret err) |
1498 | (%ioctl (fileno socket) SIOCGIFADDR | |
1499 | (bytevector->pointer req)))) | |
c9bf64d6 LC |
1500 | (if (zero? ret) |
1501 | (read-socket-address req IF_NAMESIZE) | |
1502 | (throw 'system-error "network-interface-address" | |
1503 | "network-interface-address on ~A: ~A" | |
1504 | (list name (strerror err)) | |
1505 | (list err)))))) | |
1506 | ||
67e5f3b7 LC |
1507 | (define (network-interface-netmask socket name) |
1508 | "Return the netmask of network interface NAME. The result is an object of | |
1509 | the same type as that returned by 'make-socket-address'." | |
1510 | (let ((req (make-bytevector ifreq-struct-size))) | |
1511 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1512 | (min (string-length name) (- IF_NAMESIZE 1))) | |
1513 | (let-values (((ret err) | |
1514 | (%ioctl (fileno socket) SIOCGIFNETMASK | |
1515 | (bytevector->pointer req)))) | |
1516 | (if (zero? ret) | |
1517 | (read-socket-address req IF_NAMESIZE) | |
1518 | (throw 'system-error "network-interface-netmask" | |
1519 | "network-interface-netmask on ~A: ~A" | |
1520 | (list name (strerror err)) | |
1521 | (list err)))))) | |
1522 | ||
e9ff8d9f LC |
1523 | (define* (configure-network-interface name sockaddr flags |
1524 | #:key netmask) | |
c9bf64d6 | 1525 | "Configure network interface NAME to use SOCKADDR, an address as returned by |
e9ff8d9f LC |
1526 | 'make-socket-address', and FLAGS, a bitwise-or of IFF_* constants. If NETMASK |
1527 | is true, it must be a socket address to use as the network mask." | |
c9bf64d6 LC |
1528 | (let ((sock (socket (sockaddr:fam sockaddr) SOCK_STREAM 0))) |
1529 | (dynamic-wind | |
1530 | (const #t) | |
1531 | (lambda () | |
1532 | (set-network-interface-address sock name sockaddr) | |
e9ff8d9f LC |
1533 | (set-network-interface-flags sock name flags) |
1534 | (when netmask | |
1535 | (set-network-interface-netmask sock name netmask))) | |
c9bf64d6 LC |
1536 | (lambda () |
1537 | (close-port sock))))) | |
1538 | ||
6944fdbd LC |
1539 | (define* (set-network-interface-up name |
1540 | #:key (family AF_INET)) | |
1541 | "Turn up the interface NAME." | |
1542 | (let ((sock (socket family SOCK_STREAM 0))) | |
1543 | (dynamic-wind | |
1544 | (const #t) | |
1545 | (lambda () | |
1546 | (let ((flags (network-interface-flags sock name))) | |
1547 | (set-network-interface-flags sock name | |
1548 | (logior flags IFF_UP)))) | |
1549 | (lambda () | |
1550 | (close-port sock))))) | |
1551 | ||
e7f5691d | 1552 | \f |
9e38e3cf LC |
1553 | ;;; |
1554 | ;;; Network routes. | |
1555 | ;;; | |
1556 | ||
1557 | (define-c-struct %rtentry ;'struct rtentry' from <net/route.h> | |
1558 | sizeof-rtentry | |
1559 | list | |
1560 | read-rtentry | |
1561 | write-rtentry! | |
1562 | (pad1 unsigned-long) | |
1563 | (destination (array uint8 16)) ;struct sockaddr | |
1564 | (gateway (array uint8 16)) ;struct sockaddr | |
1565 | (genmask (array uint8 16)) ;struct sockaddr | |
1566 | (flags unsigned-short) | |
1567 | (pad2 short) | |
1568 | (pad3 long) | |
1569 | (tos uint8) | |
1570 | (class uint8) | |
1571 | (pad4 (array uint8 (if (= 8 (sizeof* '*)) 3 1))) | |
1572 | (metric short) | |
1573 | (device '*) | |
1574 | (mtu unsigned-long) | |
1575 | (window unsigned-long) | |
1576 | (initial-rtt unsigned-short)) | |
1577 | ||
1578 | (define RTF_UP #x0001) ;'rtentry' flags from <net/route.h> | |
1579 | (define RTF_GATEWAY #x0002) | |
1580 | ||
1581 | (define %sockaddr-any | |
1582 | (make-socket-address AF_INET INADDR_ANY 0)) | |
1583 | ||
1584 | (define add-network-route/gateway | |
1585 | ;; To allow field names to be matched as literals, we need to move them out | |
1586 | ;; of the lambda's body since the parameters have the same name. A lot of | |
1587 | ;; fuss for very little. | |
1588 | (let-syntax ((gateway-offset (identifier-syntax | |
1589 | (c-struct-field-offset %rtentry gateway))) | |
1590 | (destination-offset (identifier-syntax | |
1591 | (c-struct-field-offset %rtentry destination))) | |
1592 | (genmask-offset (identifier-syntax | |
1593 | (c-struct-field-offset %rtentry genmask)))) | |
1594 | (lambda* (socket gateway | |
1595 | #:key (destination %sockaddr-any) (genmask %sockaddr-any)) | |
1596 | "Add a network route for DESTINATION (a socket address as returned by | |
1597 | 'make-socket-address') that goes through GATEWAY (a socket address). For | |
1598 | instance, the call: | |
1599 | ||
1600 | (add-network-route/gateway sock | |
1601 | (make-socket-address | |
1602 | AF_INET | |
1603 | (inet-pton AF_INET \"192.168.0.1\") | |
1604 | 0)) | |
1605 | ||
1606 | is equivalent to this 'net-tools' command: | |
1607 | ||
1608 | route add -net default gw 192.168.0.1 | |
1609 | ||
1610 | because the default value of DESTINATION is \"0.0.0.0\"." | |
1611 | (let ((route (make-bytevector sizeof-rtentry 0))) | |
1612 | (write-socket-address! gateway route gateway-offset) | |
1613 | (write-socket-address! destination route destination-offset) | |
1614 | (write-socket-address! genmask route genmask-offset) | |
1615 | (bytevector-u16-native-set! route | |
1616 | (c-struct-field-offset %rtentry flags) | |
1617 | (logior RTF_UP RTF_GATEWAY)) | |
1618 | (let-values (((ret err) | |
1619 | (%ioctl (fileno socket) SIOCADDRT | |
1620 | (bytevector->pointer route)))) | |
1621 | (unless (zero? ret) | |
1622 | (throw 'system-error "add-network-route/gateway" | |
1623 | "add-network-route/gateway: ~A" | |
1624 | (list (strerror err)) | |
1625 | (list err)))))))) | |
1626 | ||
1627 | (define delete-network-route | |
1628 | (let-syntax ((destination-offset (identifier-syntax | |
1629 | (c-struct-field-offset %rtentry destination)))) | |
1630 | (lambda* (socket destination) | |
1631 | "Delete the network route for DESTINATION. For instance, the call: | |
1632 | ||
1633 | (delete-network-route sock | |
1634 | (make-socket-address AF_INET INADDR_ANY 0)) | |
1635 | ||
1636 | is equivalent to the 'net-tools' command: | |
1637 | ||
1638 | route del -net default | |
1639 | " | |
1640 | ||
1641 | (let ((route (make-bytevector sizeof-rtentry 0))) | |
1642 | (write-socket-address! destination route destination-offset) | |
1643 | (let-values (((ret err) | |
1644 | (%ioctl (fileno socket) SIOCDELRT | |
1645 | (bytevector->pointer route)))) | |
1646 | (unless (zero? ret) | |
1647 | (throw 'system-error "delete-network-route" | |
1648 | "delete-network-route: ~A" | |
1649 | (list (strerror err)) | |
1650 | (list err)))))))) | |
1651 | ||
1652 | \f | |
e7f5691d LC |
1653 | ;;; |
1654 | ;;; Details about network interfaces---aka. 'getifaddrs'. | |
1655 | ;;; | |
1656 | ||
1657 | ;; Network interfaces. XXX: We would call it <network-interface> but that | |
1658 | ;; would collide with the ioctl wrappers above. | |
1659 | (define-record-type <interface> | |
1660 | (make-interface name flags address netmask broadcast-address) | |
1661 | interface? | |
1662 | (name interface-name) ;string | |
1663 | (flags interface-flags) ;or'd IFF_* values | |
1664 | (address interface-address) ;sockaddr | #f | |
1665 | (netmask interface-netmask) ;sockaddr | #f | |
1666 | (broadcast-address interface-broadcast-address)) ;sockaddr | #f | |
1667 | ||
1668 | (define (write-interface interface port) | |
1669 | (match interface | |
1670 | (($ <interface> name flags address) | |
1671 | (format port "#<interface ~s " name) | |
1672 | (unless (zero? (logand IFF_UP flags)) | |
1673 | (display "up " port)) | |
001dae0d LC |
1674 | |
1675 | ;; Check whether ADDRESS really is a sockaddr. | |
1676 | (when address | |
1677 | (if (member (sockaddr:fam address) (list AF_INET AF_INET6)) | |
1678 | (format port "~a " (inet-ntop (sockaddr:fam address) | |
1679 | (sockaddr:addr address))) | |
1680 | (format port "family:~a " (sockaddr:fam address)))) | |
1681 | ||
e7f5691d LC |
1682 | (format port "~a>" (number->string (object-address interface) 16))))) |
1683 | ||
1684 | (set-record-type-printer! <interface> write-interface) | |
1685 | ||
1686 | (define (values->interface next name flags address netmask | |
1687 | broadcast-address data) | |
1688 | "Given the raw field values passed as arguments, return a pair whose car is | |
1689 | an <interface> object, and whose cdr is the pointer NEXT." | |
1690 | (define (maybe-socket-address pointer) | |
1691 | (if (null-pointer? pointer) | |
1692 | #f | |
1693 | (read-socket-address (pointer->bytevector pointer 50)))) ;XXX: size | |
1694 | ||
1695 | (cons (make-interface (if (null-pointer? name) | |
1696 | #f | |
1697 | (pointer->string name)) | |
1698 | flags | |
1699 | (maybe-socket-address address) | |
1700 | (maybe-socket-address netmask) | |
1701 | (maybe-socket-address broadcast-address) | |
1702 | ;; Ignore DATA. | |
1703 | ) | |
1704 | next)) | |
1705 | ||
1706 | (define-c-struct ifaddrs ;<ifaddrs.h> | |
785cfa87 | 1707 | %sizeof-ifaddrs |
e7f5691d LC |
1708 | values->interface |
1709 | read-ifaddrs | |
1710 | write-ifaddrs! | |
1711 | (next '*) | |
1712 | (name '*) | |
1713 | (flags unsigned-int) | |
1714 | (addr '*) | |
1715 | (netmask '*) | |
1716 | (broadcastaddr '*) | |
1717 | (data '*)) | |
1718 | ||
e7f5691d LC |
1719 | (define (unfold-interface-list ptr) |
1720 | "Call 'read-ifaddrs' on PTR and all its 'next' fields, recursively, and | |
1721 | return the list of resulting <interface> objects." | |
1722 | (let loop ((ptr ptr) | |
1723 | (result '())) | |
1724 | (if (null-pointer? ptr) | |
1725 | (reverse result) | |
f77863a0 | 1726 | (match (read-ifaddrs (pointer->bytevector ptr %sizeof-ifaddrs)) |
e7f5691d LC |
1727 | ((ifaddr . ptr) |
1728 | (loop ptr (cons ifaddr result))))))) | |
1729 | ||
1730 | (define network-interfaces | |
d1f33ba4 | 1731 | (let ((proc (syscall->procedure int "getifaddrs" (list '*)))) |
e7f5691d LC |
1732 | (lambda () |
1733 | "Return a list of <interface> objects, each denoting a configured | |
1734 | network interface. This is implemented using the 'getifaddrs' libc function." | |
26ffb693 LC |
1735 | (let*-values (((ptr) |
1736 | (bytevector->pointer (make-bytevector (sizeof* '*)))) | |
1737 | ((ret err) | |
1738 | (proc ptr))) | |
e7f5691d LC |
1739 | (if (zero? ret) |
1740 | (let* ((ptr (dereference-pointer ptr)) | |
1741 | (result (unfold-interface-list ptr))) | |
1742 | (free-ifaddrs ptr) | |
1743 | result) | |
1744 | (throw 'system-error "network-interfaces" "~A" | |
1745 | (list (strerror err)) | |
1746 | (list err))))))) | |
1747 | ||
1748 | (define free-ifaddrs | |
d1f33ba4 | 1749 | (syscall->procedure void "freeifaddrs" '(*))) |
e7f5691d | 1750 | |
29ff6d9f LC |
1751 | \f |
1752 | ;;; | |
1753 | ;;; Terminals. | |
1754 | ;;; | |
1755 | ||
ae4ff9f3 LC |
1756 | (define-syntax bits->symbols-body |
1757 | (syntax-rules () | |
1758 | ((_ bits () ()) | |
1759 | '()) | |
1760 | ((_ bits (name names ...) (value values ...)) | |
1761 | (let ((result (bits->symbols-body bits (names ...) (values ...)))) | |
1762 | (if (zero? (logand bits value)) | |
1763 | result | |
1764 | (cons 'name result)))))) | |
1765 | ||
1766 | (define-syntax define-bits | |
1767 | (syntax-rules (define) | |
1768 | "Define the given numerical constants under CONSTRUCTOR, such that | |
1769 | (CONSTRUCTOR NAME) returns VALUE. Define BITS->SYMBOLS as a procedure that, | |
1770 | given an integer, returns the list of names of the constants that are or'd." | |
1771 | ((_ constructor bits->symbols (define names values) ...) | |
1772 | (begin | |
1773 | (define-syntax constructor | |
1774 | (syntax-rules (names ...) | |
334c9530 | 1775 | ((_) 0) |
ae4ff9f3 | 1776 | ((_ names) values) ... |
334c9530 LC |
1777 | ((_ first rest (... ...)) |
1778 | (logior (constructor first) rest (... ...))))) | |
ae4ff9f3 | 1779 | (define (bits->symbols bits) |
334c9530 | 1780 | (bits->symbols-body bits (names ...) (values ...))))))) |
ae4ff9f3 LC |
1781 | |
1782 | ;; 'local-flags' bits from <bits/termios.h> | |
1783 | (define-bits local-flags | |
1784 | local-flags->symbols | |
1785 | (define ISIG #o0000001) | |
1786 | (define ICANON #o0000002) | |
1787 | (define XCASE #o0000004) | |
1788 | (define ECHO #o0000010) | |
1789 | (define ECHOE #o0000020) | |
1790 | (define ECHOK #o0000040) | |
1791 | (define ECHONL #o0000100) | |
1792 | (define NOFLSH #o0000200) | |
1793 | (define TOSTOP #o0000400) | |
1794 | (define ECHOCTL #o0001000) | |
1795 | (define ECHOPRT #o0002000) | |
1796 | (define ECHOKE #o0004000) | |
1797 | (define FLUSHO #o0010000) | |
1798 | (define PENDIN #o0040000) | |
1799 | (define IEXTEN #o0100000) | |
1800 | (define EXTPROC #o0200000)) | |
1801 | ||
45c32bd7 LC |
1802 | (define-bits input-flags |
1803 | input-flags->symbols | |
1804 | (define IGNBRK #o0000001) | |
1805 | (define BRKINT #o0000002) | |
1806 | (define IGNPAR #o0000004) | |
1807 | (define PARMRK #o0000010) | |
1808 | (define INPCK #o0000020) | |
1809 | (define ISTRIP #o0000040) | |
1810 | (define INLCR #o0000100) | |
1811 | (define IGNCR #o0000200) | |
1812 | (define ICRNL #o0000400) | |
1813 | (define IUCLC #o0001000) | |
1814 | (define IXON #o0002000) | |
1815 | (define IXANY #o0004000) | |
1816 | (define IXOFF #o0010000) | |
1817 | (define IMAXBEL #o0020000) | |
1818 | (define IUTF8 #o0040000)) | |
1819 | ||
ae4ff9f3 | 1820 | ;; "Actions" values for 'tcsetattr'. |
a8f3424b LC |
1821 | (define-bits tcsetattr-action |
1822 | %unused-tcsetattr-action->symbols | |
1823 | (define TCSANOW 0) | |
1824 | (define TCSADRAIN 1) | |
1825 | (define TCSAFLUSH 2)) | |
ae4ff9f3 LC |
1826 | |
1827 | (define-record-type <termios> | |
1828 | (termios input-flags output-flags control-flags local-flags | |
1829 | line-discipline control-chars | |
1830 | input-speed output-speed) | |
1831 | termios? | |
1832 | (input-flags termios-input-flags) | |
1833 | (output-flags termios-output-flags) | |
1834 | (control-flags termios-control-flags) | |
1835 | (local-flags termios-local-flags) | |
1836 | (line-discipline termios-line-discipline) | |
1837 | (control-chars termios-control-chars) | |
1838 | (input-speed termios-input-speed) | |
1839 | (output-speed termios-output-speed)) | |
1840 | ||
1841 | (define-c-struct %termios ;<bits/termios.h> | |
1842 | sizeof-termios | |
1843 | termios | |
1844 | read-termios | |
1845 | write-termios! | |
1846 | (input-flags unsigned-int) | |
1847 | (output-flags unsigned-int) | |
1848 | (control-flags unsigned-int) | |
1849 | (local-flags unsigned-int) | |
1850 | (line-discipline uint8) | |
1851 | (control-chars (array uint8 32)) | |
1852 | (input-speed unsigned-int) | |
1853 | (output-speed unsigned-int)) | |
1854 | ||
1855 | (define tcgetattr | |
1856 | (let ((proc (syscall->procedure int "tcgetattr" (list int '*)))) | |
1857 | (lambda (fd) | |
1858 | "Return the <termios> structure for the tty at FD." | |
26ffb693 LC |
1859 | (let*-values (((bv) (make-bytevector sizeof-termios)) |
1860 | ((ret err) (proc fd (bytevector->pointer bv)))) | |
ae4ff9f3 LC |
1861 | (if (zero? ret) |
1862 | (read-termios bv) | |
1863 | (throw 'system-error "tcgetattr" "~A" | |
1864 | (list (strerror err)) | |
1865 | (list err))))))) | |
1866 | ||
1867 | (define tcsetattr | |
1868 | (let ((proc (syscall->procedure int "tcsetattr" (list int int '*)))) | |
1869 | (lambda (fd actions termios) | |
a8f3424b LC |
1870 | "Use TERMIOS for the tty at FD. ACTIONS is one of of the values |
1871 | produced by 'tcsetattr-action'; see tcsetattr(3) for details." | |
ae4ff9f3 LC |
1872 | (define bv |
1873 | (make-bytevector sizeof-termios)) | |
1874 | ||
1875 | (let-syntax ((match/write (syntax-rules () | |
1876 | ((_ fields ...) | |
1877 | (match termios | |
1878 | (($ <termios> fields ...) | |
1879 | (write-termios! bv 0 fields ...))))))) | |
1880 | (match/write input-flags output-flags control-flags local-flags | |
1881 | line-discipline control-chars input-speed output-speed)) | |
1882 | ||
26ffb693 | 1883 | (let-values (((ret err) (proc fd actions (bytevector->pointer bv)))) |
ae4ff9f3 LC |
1884 | (unless (zero? ret) |
1885 | (throw 'system-error "tcgetattr" "~A" | |
1886 | (list (strerror err)) | |
1887 | (list err))))))) | |
1888 | ||
29ff6d9f LC |
1889 | (define-syntax TIOCGWINSZ ;<asm-generic/ioctls.h> |
1890 | (identifier-syntax #x5413)) | |
1891 | ||
1892 | (define-record-type <window-size> | |
1893 | (window-size rows columns x-pixels y-pixels) | |
1894 | window-size? | |
1895 | (rows window-size-rows) | |
1896 | (columns window-size-columns) | |
1897 | (x-pixels window-size-x-pixels) | |
1898 | (y-pixels window-size-y-pixels)) | |
1899 | ||
1900 | (define-c-struct winsize ;<bits/ioctl-types.h> | |
785cfa87 | 1901 | sizeof-winsize |
29ff6d9f LC |
1902 | window-size |
1903 | read-winsize | |
1904 | write-winsize! | |
1905 | (rows unsigned-short) | |
1906 | (columns unsigned-short) | |
1907 | (x-pixels unsigned-short) | |
1908 | (y-pixels unsigned-short)) | |
1909 | ||
29ff6d9f LC |
1910 | (define* (terminal-window-size #:optional (port (current-output-port))) |
1911 | "Return a <window-size> structure describing the terminal at PORT, or raise | |
1912 | a 'system-error' if PORT is not backed by a terminal. This procedure | |
1913 | corresponds to the TIOCGWINSZ ioctl." | |
26ffb693 LC |
1914 | (let*-values (((size) (make-bytevector sizeof-winsize)) |
1915 | ((ret err) (%ioctl (fileno port) TIOCGWINSZ | |
1916 | (bytevector->pointer size)))) | |
29ff6d9f | 1917 | (if (zero? ret) |
785cfa87 | 1918 | (read-winsize size) |
29ff6d9f LC |
1919 | (throw 'system-error "terminal-window-size" "~A" |
1920 | (list (strerror err)) | |
1921 | (list err))))) | |
1922 | ||
4593f5a6 LC |
1923 | (define (terminal-dimension window-dimension port fall-back) |
1924 | "Return the terminal dimension defined by WINDOW-DIMENSION, one of | |
1925 | 'window-size-columns' or 'window-size-rows' for PORT. If PORT does not | |
1926 | correspond to a terminal, return the value returned by FALL-BACK." | |
29ff6d9f LC |
1927 | (catch 'system-error |
1928 | (lambda () | |
6d2b4391 | 1929 | (if (file-port? port) |
4593f5a6 | 1930 | (match (window-dimension (terminal-window-size port)) |
6d2b4391 LC |
1931 | ;; Things like Emacs shell-mode return 0, which is unreasonable. |
1932 | (0 (fall-back)) | |
4593f5a6 | 1933 | ((? number? n) n)) |
6d2b4391 | 1934 | (fall-back))) |
29ff6d9f LC |
1935 | (lambda args |
1936 | (let ((errno (system-error-errno args))) | |
5cd25aad LC |
1937 | ;; ENOTTY is what we're after but 2012-and-earlier Linux versions |
1938 | ;; would return EINVAL instead in some cases: | |
1939 | ;; <https://bugs.ruby-lang.org/issues/10494>. | |
a6e0ae40 LC |
1940 | ;; Furthermore, some FUSE file systems like unionfs return ENOSYS for |
1941 | ;; that ioctl. | |
1942 | (if (memv errno (list ENOTTY EINVAL ENOSYS)) | |
29ff6d9f LC |
1943 | (fall-back) |
1944 | (apply throw args)))))) | |
1945 | ||
4593f5a6 LC |
1946 | (define* (terminal-columns #:optional (port (current-output-port))) |
1947 | "Return the best approximation of the number of columns of the terminal at | |
1948 | PORT, trying to guess a reasonable value if all else fails. The result is | |
1949 | always a positive integer." | |
1950 | (define (fall-back) | |
1951 | (match (and=> (getenv "COLUMNS") string->number) | |
1952 | (#f 80) | |
1953 | ((? number? columns) | |
1954 | (if (> columns 0) columns 80)))) | |
1955 | ||
1956 | (terminal-dimension window-size-columns port fall-back)) | |
1957 | ||
1958 | (define* (terminal-rows #:optional (port (current-output-port))) | |
1959 | "Return the best approximation of the number of rows of the terminal at | |
1960 | PORT, trying to guess a reasonable value if all else fails. The result is | |
1961 | always a positive integer." | |
1962 | (terminal-dimension window-size-rows port (const 25))) | |
1963 | ||
15030972 LC |
1964 | \f |
1965 | ;;; | |
1966 | ;;; utmpx. | |
1967 | ;;; | |
1968 | ||
1969 | (define-record-type <utmpx-entry> | |
1970 | (utmpx type pid line id user host termination exit | |
1971 | session time address) | |
1972 | utmpx? | |
1973 | (type utmpx-login-type) ;login-type | |
1974 | (pid utmpx-pid) | |
1975 | (line utmpx-line) ;device name | |
1976 | (id utmpx-id) | |
1977 | (user utmpx-user) ;user name | |
1978 | (host utmpx-host) ;host name | #f | |
1979 | (termination utmpx-termination-status) | |
1980 | (exit utmpx-exit-status) | |
1981 | (session utmpx-session-id) ;session ID, for windowing | |
1982 | (time utmpx-time) ;entry time | |
1983 | (address utmpx-address)) | |
1984 | ||
1985 | (define-c-struct %utmpx ;<utmpx.h> | |
1986 | sizeof-utmpx | |
1987 | (lambda (type pid line id user host termination exit session | |
1988 | seconds useconds address %reserved) | |
1989 | (utmpx type pid | |
1990 | (bytes->string line) id | |
1991 | (bytes->string user) | |
1992 | (bytes->string host) termination exit | |
1993 | session | |
1994 | (make-time time-utc (* 1000 useconds) seconds) | |
1995 | address)) | |
1996 | read-utmpx | |
1997 | write-utmpx! | |
1998 | (type short) | |
1999 | (pid int) | |
2000 | (line (array uint8 32)) | |
2001 | (id (array uint8 4)) | |
2002 | (user (array uint8 32)) | |
2003 | (host (array uint8 256)) | |
2004 | (termination short) | |
2005 | (exit short) | |
2006 | (session int32) | |
2007 | (time-seconds int32) | |
2008 | (time-useconds int32) | |
2009 | (address-v6 (array int32 4)) | |
2010 | (%reserved (array uint8 20))) | |
2011 | ||
2012 | (define-bits login-type | |
2013 | %unused-login-type->symbols | |
2014 | (define EMPTY 0) ;No valid user accounting information. | |
2015 | (define RUN_LVL 1) ;The system's runlevel. | |
2016 | (define BOOT_TIME 2) ;Time of system boot. | |
2017 | (define NEW_TIME 3) ;Time after system clock changed. | |
2018 | (define OLD_TIME 4) ;Time when system clock changed. | |
2019 | ||
2020 | (define INIT_PROCESS 5) ;Process spawned by the init process. | |
2021 | (define LOGIN_PROCESS 6) ;Session leader of a logged in user. | |
2022 | (define USER_PROCESS 7) ;Normal process. | |
2023 | (define DEAD_PROCESS 8) ;Terminated process. | |
2024 | ||
2025 | (define ACCOUNTING 9)) ;System accounting. | |
2026 | ||
2027 | (define setutxent | |
2028 | (let ((proc (syscall->procedure void "setutxent" '()))) | |
2029 | (lambda () | |
2030 | "Open the user accounting database." | |
2031 | (proc)))) | |
2032 | ||
2033 | (define endutxent | |
2034 | (let ((proc (syscall->procedure void "endutxent" '()))) | |
2035 | (lambda () | |
2036 | "Close the user accounting database." | |
2037 | (proc)))) | |
2038 | ||
2039 | (define getutxent | |
2040 | (let ((proc (syscall->procedure '* "getutxent" '()))) | |
2041 | (lambda () | |
2042 | "Return the next entry from the user accounting database." | |
2043 | (let ((ptr (proc))) | |
2044 | (if (null-pointer? ptr) | |
2045 | #f | |
2046 | (read-utmpx (pointer->bytevector ptr sizeof-utmpx))))))) | |
2047 | ||
2048 | (define (utmpx-entries) | |
2049 | "Return the list of entries read from the user accounting database." | |
2050 | (setutxent) | |
2051 | (let loop ((entries '())) | |
2052 | (match (getutxent) | |
2053 | (#f | |
2054 | (endutxent) | |
2055 | (reverse entries)) | |
2056 | ((? utmpx? entry) | |
2057 | (loop (cons entry entries)))))) | |
2058 | ||
3483f004 LC |
2059 | (define (read-utmpx-from-port port) |
2060 | "Read a utmpx entry from PORT. Return either the EOF object or a utmpx | |
2061 | entry." | |
2062 | (match (get-bytevector-n port sizeof-utmpx) | |
2063 | ((? eof-object? eof) | |
2064 | eof) | |
2065 | ((? bytevector? bv) | |
2066 | (read-utmpx bv)))) | |
2067 | ||
29fa45f4 | 2068 | ;;; syscalls.scm ends here |